- 290 (number)
290 is the
natural number after 289 and before 291.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. If you multiply 5,2,and 29, you get 290.Not only is it a
nontotient and anoncototient , it is also anuntouchable number .290 is the 16th member of the
Mian-Chowla sequence ; it can't be obtained as the sum of any two previous terms in the sequence.See also Conway's
290 theorem .In other fields
*"290" is one of
Naoki Maeda 's pseudonyms.
*"290" was the shipyard number of the "CSS Alabama "See also the year
290 .291 to 299
*Two hundred [and] ninety-one 291 = 3·97
*Two hundred [and] ninety-two 292 = 22·73, noncototient, untouchable number. Thecontinued fraction representation ofpi 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 pi,repdigit in base 8 (444).
*Two hundred [and] ninety-three 293 prime,Sophie Germain prime ,Chen prime ,Eisenstein prime with no imaginary part,strictly non-palindromic number . For 293 cells in cell biology, seeHEK cell .
*Two hundred [and] ninety-four 294 = 2·3·72
*Two hundred [and] ninety-five 295 = 5·59, also, the numerical designation of seven spur routes ofInterstate 95 in theUnited States .
*Two hundred [and] ninety-six 296 = 23·37
*Two hundred [and] ninety-seven 297 = 33·11,decagonal number ,Kaprekar number
*Two hundred [and] ninety-eight 298 = 2·149, nontotient, noncototient
*Two hundred [and] ninety-nine 299 = 13·23,highly cototient number ,self number , the twelfth cake number
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