290 (number)
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| ||||
|---|---|---|---|---|
| Cardinal | two hundred ninety | |||
| Ordinal | 290th (two hundred ninetieth) | |||
| Factorization | 2 × 5 × 29 | |||
| Greek numeral | ΣϞ´ | |||
| Roman numeral | CCXC, ccxc | |||
| Binary | 1001000102 | |||
| Ternary | 1012023 | |||
| Senary | 12026 | |||
| Octal | 4428 | |||
| Duodecimal | 20212 | |||
| Hexadecimal | 12216 | |||
290 (two hundred [and] ninety) is the natural number following 289 and preceding 291.
In mathematics
[edit]The product of three primes, 290 is a sphenic number,[1] 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[2] and a noncototient,[3] it is also an untouchable number.[4]
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.[5]
See also the Bhargava–Hanke 290 theorem.
References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A007304 (sphenic numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005277 (nontotients)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005278 (noncototient)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005114 (untouchable numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.