290 (number)
290 is the natural number following 289 and preceding 291.In mathematics
The product of three primes, 290 is a sphenic number, and the sum of four consecutive primes. 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
292
292 = 22·73, noncototient, untouchable number. The continued fraction representation of pi is ; the convergent obtained by truncating before the surprisingly large term 292 yields the excellent rational approximation 355/113 to pi, repdigit in base 8.293
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 = 2·3·72, unique period in base 10295
295 = 5·59, also, the numerical designation of seven circumferential or half-circumferential routes of Interstate 95 in the United States.296
296 = 23·37, unique period in base 2297
297 = 33·11, number of integer partitions of 17, decagonal number, Kaprekar number298
298 = 2·149, nontotient, noncototient299
299 = 13·23, highly cototient number, self number, the twelfth cake number
