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 | |||
Binary | 1001000102 | |||
Ternary | 1012023 | |||
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, 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.
In other fields[edit]
- "290" was the shipyard number of the CSS Alabama
See also the year 290.
Integers from 291 to 299[edit]
291[edit]
291 = 3·97, a semiprime.
292[edit]
292 = 22·73, noncototient, untouchable number. The continued fraction representation of 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 , repdigit in base 8 (444).
293[edit]
293 is 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[edit]
294 = 2·3·72, unique period in base 10
295[edit]
295 = 5·59, also, the numerical designation of seven circumferential or half-circumferential routes of Interstate 95 in the United States.
296[edit]
296 = 23·37, unique period in base 2
297[edit]
297 = 33·11, number of integer partitions of 17, decagonal number, Kaprekar number
298[edit]
298 = 2·149, nontotient, noncototient
299[edit]
299 = 13·23, highly cototient number, self number, the twelfth cake number
References[edit]
- ^ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.