290 (number)

290

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List of numbers — Integers

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two hundred ninety

290th
(two hundred ninetieth)

2 × 5 × 29

CCXC

100100010₂

101202₃

10202₄

2130₅

1202₆

442₈

202₁₂

122₁₆

EA₂₀

82₃₆

290 (two hundred [and] ninety) is the natural number after 289 and before 291.

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 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.

See also the year 290.

Two hundred [and] ninety-one 291 = 3·97, a semiprime.

Two hundred [and] ninety-two 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 pi, repdigit in base 8 (444).

Two hundred [and] ninety-three 293 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.

Two hundred [and] ninety-four 294 = 2·3·7², unique period in base 10

Two hundred [and] ninety-five 295 = 5·59, also, the numerical designation of seven circumfrental or half-circumfrental routes of Interstate 95 in the United States.

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