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290 (number)

From Wikipedia, the free encyclopedia
← 289 290 291 →
Cardinaltwo hundred ninety
Ordinal290th
(two hundred ninetieth)
Factorization2 × 5 × 29
Greek numeralΣϞ´
Roman numeralCCXC
Binary1001000102
Ternary1012023
Senary12026
Octal4428
Duodecimal20212
Hexadecimal12216

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

In mathematics

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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.[1]

See also the Bhargava–Hanke 290 theorem.

Integers from 291 to 299

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291

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292

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293

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294

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295

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296

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297

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298

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299

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References

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  1. ^ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.