300 (three hundred) is the natural number following 299 and preceding 301.
300 is a composite number and the 24th triangular number. It is also a second hexagonal number.
316 = 2<sup>2</sup> × 79, a centered triangular number and a centered heptagonal number.
317 is the smallest natural number that does not have its own Wikipedia article (only a and ), a fact that has itself been noted as making the number notable, creating a situation similar to the interesting number paradox.
317 is a prime number, Eisenstein prime with no imaginary part, Chen prime, one of the rare primes to be both right and left-truncatable, and a strictly non-palindromic number.
317 is the exponent (and number of ones) in the fourth base-10 repunit prime.
319 = 11 × 29. 319 is the sum of three consecutive primes (103 + 107 + 109), Smith number, cannot be represented as the sum of fewer than 19 fourth powers, happy number in base 10
320 = 2<sup>6</sup> × 5 = (2<sup>5</sup>) × (2 × 5). 320 is a Leyland number, and maximum determinant of a 10 by 10 matrix of zeros and ones.
321 = 3 × 107, a Delannoy number
322 = 2 × 7 × 23. 322 is a sphenic, nontotient, untouchable, and a Lucas number. It is also the first unprimeable number to end in 2.
324 = 2<sup>2</sup> × 3<sup>4</sup> = 18<sup>2</sup>. 324 is the sum of four consecutive primes (73 + 79 + 83 + 89), totient sum of the first 32 integers, a square number, and an untouchable number.
326 = 2 × 163. 326 is a nontotient, noncototient, and an untouchable number. 326 is the sum of the 14 consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47), lazy caterer number
327 = 3 × 109. 327 is a perfect totient number, number of compositions of 10 whose run-lengths are either weakly increasing or weakly decreasing
328 = 2<sup>3</sup> × 41. 328 is a refactorable number, and it is the sum of the first fifteen primes (2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47).
329 = 7 × 47. 329 is the sum of three consecutive primes (107 + 109 + 113), and a highly cototient number.
330 = 2 × 3 × 5 × 11. 330 is sum of six consecutive primes (43 + 47 + 53 + 59 + 61 + 67), pentatope number (and hence a binomial coefficient ), a pentagonal number, divisible by the number of primes below it, and a sparsely totient number.
331 is a prime number, super-prime, cuban prime, a lucky prime, sum of five consecutive primes (59 + 61 + 67 + 71 + 73), centered pentagonal number, centered hexagonal number, and Mertens function returns 0.
332 = 2<sup>2</sup> × 83, Mertens function returns 0.
333 = 3<sup>2</sup> × 37, Mertens function returns 0; repdigit; 2<sup>333</sup> is the smallest power of two greater than a googol.
334 = 2 × 167, nontotient.
335 = 5 × 67. 335 is divisible by the number of primes below it, number of Lyndon words of length 12.
336 = 2<sup>4</sup> × 3 × 7, untouchable number, number of partitions of 41 into prime parts, largely composite number.
337, prime number, emirp, permutable prime with 373 and 733, Chen prime, star number
338 = 2 × 13<sup>2</sup>, nontotient, number of square (0,1)-matrices without zero rows and with exactly 4 entries equal to 1.
339 = 3 × 113, Ulam number
340 = 2<sup>2</sup> × 5 × 17, sum of eight consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53 + 59), sum of ten consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53), sum of the first four powers of 4 (4<sup>1</sup> + 4<sup>2</sup> + 4<sup>3</sup> + 4<sup>4</sup>), divisible by the number of primes below it, nontotient, noncototient. Number of regions formed by drawing the line segments connecting any two of the 12 perimeter points of a 3 times 3 grid of squares and .
342 = 2 × 3<sup>2</sup> × 19, pronic number, Untouchable number.
343 = 7<sup>3</sup>, the first nice Friedman number that is composite since 343 = (3 + 4)<sup>3</sup>. It is the only known example of x<sup>2</sup>+x+1 = y<sup>3</sup>, in this case, x=18, y=7. It is z<sup>3</sup> in a triplet (x,y,z) such that x<sup>5</sup> + y<sup>2</sup> = z<sup>3</sup>.
344 = 2<sup>3</sup> × 43, octahedral number, noncototient, totient sum of the first 33 integers, refactorable number.
345 = 3 × 5 × 23, sphenic number, idoneal number
346 = 2 × 173, Smith number, noncototient.
347 is a prime number, emirp, safe prime, Eisenstein prime with no imaginary part, Chen prime, Friedman prime since 347 = 7<sup>3</sup> + 4, twin prime with 349, and a strictly non-palindromic number.
348 = 2<sup>2</sup> × 3 × 29, sum of four consecutive primes (79 + 83 + 89 + 97), refactorable number.
349, prime number, twin prime, lucky prime, sum of three consecutive primes (109 + 113 + 127), 5<sup>349</sup> - 4<sup>349</sup> is a prime number.
350 = 2 × 5<sup>2</sup> × 7 = , primitive semiperfect number, divisible by the number of primes below it, nontotient, a truncated icosahedron of frequency 6 has 350 hexagonal faces and 12 pentagonal faces.
351 = 3<sup>3</sup> × 13, 26th triangular number, sum of five consecutive primes (61 + 67 + 71 + 73 + 79), member of Padovan sequence and number of compositions of 15 into distinct parts.
352 = 2<sup>5</sup> × 11, the number of n-Queens Problem solutions for n = 9. It is the sum of two consecutive primes (173 + 179), lazy caterer number
354 = 2 × 3 × 59 = 1<sup>4</sup> + 2<sup>4</sup> + 3<sup>4</sup> + 4<sup>4</sup>, sphenic number, nontotient, also SMTP code meaning start of mail input. It is also sum of absolute value of the coefficients of Conway's polynomial.
355 = 5 × 71, Smith number, Mertens function returns 0, divisible by the number of primes below it. The cototient of 355 is 75, where 75 is the product of its digits (3 x 5 x 5 = 75).
The numerator of the best simplified rational approximation of pi having a denominator of four digits or fewer. This fraction (355/113) is known as Milü and provides an extremely accurate approximation for pi, being accurate to seven digits.
356 = 2<sup>2</sup> × 89, Mertens function returns 0.
357 = 3 × 7 × 17, sphenic number.
358 = 2 × 179, sum of six consecutive primes (47 + 53 + 59 + 61 + 67 + 71), Mertens function returns 0, number of ways to partition {1,2,3,4,5} and then partition each cell (block) into subcells.
361 = 19<sup>2</sup>. 361 is a centered triangular number, centered octagonal number, centered decagonal number, member of the MianâÂÂChowla sequence; also the number of positions on a standard 19 x 19 Go board.
362 = 2 × 181 = ÃÂ<sub>2</sub>(19): sum of squares of divisors of 19, Mertens function returns 0, nontotient, noncototient.
364 = 2<sup>2</sup> × 7 × 13, tetrahedral number, sum of twelve consecutive primes (11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53), Mertens function returns 0, nontotient. It is a repdigit in base 3 (111111), base 9 (444), base 25 (EE), base 27 (DD), base 51 (77) and base 90 (44), the sum of six consecutive powers of 3 (1 + 3 + 9 + 27 + 81 + 243), and because it is the twelfth non-zero tetrahedral number.
366 = 2 × 3 × 61, sphenic number, Mertens function returns 0, noncototient, number of complete partitions of 20, 26-gonal and 123-gonal. Also the number of days in a leap year.
367 is a prime number, a lucky prime, Perrin number, happy number, and a strictly non-palindromic number.
368 = 2<sup>4</sup> × 23. It is also a Leyland number.
370 = 2 × 5 × 37, sphenic number, sum of four consecutive primes (83 + 89 + 97 + 101), nontotient, with 369 part of a RuthâÂÂAaron pair with only distinct prime factors counted, Base 10 Armstrong number since 3<sup>3</sup> + 7<sup>3</sup> + 0<sup>3</sup> = 370.
371 = 7 × 53, sum of three consecutive primes (113 + 127 + 131), sum of seven consecutive primes (41 + 43 + 47 + 53 + 59 + 61 + 67), sum of the primes from its least to its greatest prime factor, the next such composite number is 2935561623745, Armstrong number since 3<sup>3</sup> + 7<sup>3</sup> + 1<sup>3</sup> = 371.
372 = 2<sup>2</sup> × 3 × 31, sum of eight consecutive primes (31 + 37 + 41 + 43 + 47 + 53 + 59 + 61), noncototient, untouchable number, --> refactorable number.
373, prime number, balanced prime, one of the rare primes to be both right and left-truncatable (two-sided prime), sum of five consecutive primes (67 + 71 + 73 + 79 + 83), sexy prime with 367 and 379, permutable prime with 337 and 733, palindromic prime in 3 consecutive bases: 565<sub>8</sub> = 454<sub>9</sub> = 373<sub>10</sub> and also in base 4: 11311<sub>4</sub>.
374 = 2 × 11 × 17, sphenic number, nontotient, 374<sup>4</sup> + 1 is prime.
375 = 3 × 5<sup>3</sup>, number of regions in regular 11-gon with all diagonals drawn.
376 = 2<sup>3</sup> × 47, pentagonal number, 1-automorphic number, nontotient, refactorable number.
378 = 2 × 3<sup>3</sup> × 7, 27th triangular number, cake number, hexagonal number, Smith number.
379 is a prime number, Chen prime, lazy caterer number and a happy number in base 10. It is the sum of the first 15 odd primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53). 379! - 1 is prime.
380 = 2<sup>2</sup> × 5 × 19, pronic number, number of regions into which a figure made up of a row of 6 adjacent congruent rectangles is divided upon drawing diagonals of all possible rectangles.
381 = 3 × 127, palindromic in base 2 and base 8.
381 is the sum of the first 16 prime numbers (2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53).
382 = 2 × 191, sum of ten consecutive primes (19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59), Smith number.
383, prime number, safe prime, Woodall prime, Thabit number, Eisenstein prime with no imaginary part, palindromic prime. It is also the first number where the sum of a prime and the reversal of the prime is also a prime. .
385 = 5 × 7 × 11, sphenic number, square pyramidal number, the number of integer partitions of 18.
385 = 10<sup>2</sup> + 9<sup>2</sup> + 8<sup>2</sup> + 7<sup>2</sup> + 6<sup>2</sup> + 5<sup>2</sup> + 4<sup>2</sup> + 3<sup>2</sup> + 2<sup>2</sup> + 1<sup>2</sup>
386 = 2 × 193, nontotient, noncototient, centered heptagonal number, number of surface points on a cube with edge-length 9.
387 = 3<sup>2</sup> × 43, number of graphical partitions of 22.
388 = 2<sup>2</sup> × 97 = solution to postage stamp problem with 6 stamps and 6 denominations, number of uniform rooted trees with 10 nodes.
389, prime number, emirp, Eisenstein prime with no imaginary part, Chen prime, highly cototient number, strictly non-palindromic number. Smallest conductor of a rank 2 Elliptic curve.
390 = 2 × 3 × 5 × 13, sum of four consecutive primes (89 + 97 + 101 + 103), nontotient,
391 = 17 × 23, Smith number, centered pentagonal number.
392 = 2<sup>3</sup> × 7<sup>2</sup>, Achilles number.
393 = 3 × 131, Blum integer, Mertens function returns 0.
394 = 2 × 197 = S<sub>5</sub> a Schröder number, nontotient, noncototient.
395 = 5 × 79, sum of three consecutive primes (127 + 131 + 137), sum of five consecutive primes (71 + 73 + 79 + 83 + 89), number of (unordered, unlabeled) rooted trimmed trees with 11 nodes.
396 = 2<sup>2</sup> × 3<sup>2</sup> × 11, sum of twin primes (197 + 199), totient sum of the first 36 integers, refactorable number, Harshad number, digit-reassembly number.
397, prime number, cuban prime, centered hexagonal number.
398 = 2 × 199, nontotient.
399 = 3 × 7 × 19, sphenic number, smallest LucasâÂÂCarmichael number, and a Leyland number of the second kind 399! + 1 is prime.