In mathematics
The product of three primes, 290 is a sphenic number, and the sum of four consecutive primes (67 + 71 + 73 + 79). The sum of the squares of the divisors of 17 is 290. Not only is it a nontotient and a noncototient, it is also an untouchable number. 290 is the 16th member of the Mian–Chowla sequence; it can not be obtained as the sum of any two previous terms in the sequence. See also the Bhargava–Hanke 290 theorem.In other fields
*"290" was the shipyard number of the ''CSS Alabama'' See also the year 290.Integers from 291 to 299
291
291 = 3·97, a semiprime, floor(3^14/2^14) .292
292 = 22·73, noncototient, untouchable number. The continued fraction representation of pi, is [3; 7, 15, 1, 292, 1, 1, 1, 2...]; the convergent obtained by truncating before the surprisingly large term 292 yields the excellent rational approximation 355/113 to , repdigit in base 8 (444).293
293 is prime, Sophie Germain prime, Chen prime, Irregular prime, Eisenstein prime with no imaginary part, strictly non-palindromic number. For 293 cells in cell biology, see HEK cell.294
294 = 2·3·72, number of rooted trees with 28 vertices in which vertices at the same level have the same degree .295
295 = 5·59, centered tetrahedral number, also the numerical designation of seven circumferential or half-circumferential routes of Interstate 95 in the United States.296
296 = 23·37, unique prime, unique period in base 2, number of regions formed by drawing the line segments connecting any two of the 12 perimeter points of an 2 times 4 grid of square297
297 = 33·11, number of integer partition (number theory), partitions of 17, decagonal number, Kaprekar number298
298 = 2·149, nontotient, noncototient, number of polynomial symmetric functions of matrix of order 6 under separate row and column permutations299
299 = 13·23, highly cototient number, self number, the twelfth Fair division, cake numberReferences
{{DEFAULTSORT:290 (Number) Integers