290 (number)
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| Cardinal | two hundred ninety | |||
| Ordinal |
290th (two hundred ninetieth) | |||
| Factorization | 2 × 5 × 29 | |||
| Roman numeral | CCXC | |||
| Binary | 1001000102 | |||
| Ternary | 1012023 | |||
| Quaternary | 102024 | |||
| Quinary | 21305 | |||
| Senary | 12026 | |||
| Octal | 4428 | |||
| Duodecimal | 20212 | |||
| Hexadecimal | 12216 | |||
| Vigesimal | EA20 | |||
| Base 36 | 8236 | |||
290 (two hundred [and] ninety) 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 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.
In other fields
- "290" was the shipyard number of the CSS Alabama
See also the year 290.
291 to 299
291
Two hundred [and] ninety-one 291 = 3·97, a semiprime.
292
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).
293
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.
294
Two hundred [and] ninety-four 294 = 2·3·72, unique period in base 10
295
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.
296
Two hundred [and] ninety-six 296 = 23·37, unique period in base 2
297
Two hundred [and] ninety-seven 297 = 33·11, number of integer partitions of 17, decagonal number, Kaprekar number
298
Two hundred [and] ninety-eight 298 = 2·149, nontotient, noncototient
299
Two hundred [and] ninety-nine 299 = 13·23, highly cototient number, self number, the twelfth cake number
References
- ↑ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.