266 (number)
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|---|---|---|---|---|
| Cardinal | two hundred sixty | |||
| Ordinal | 260th (two hundred sixtieth) |
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| Factorization | 22× 5 × 13 | |||
| Greek numeral | ΣΞ´ | |||
| Roman numeral | CCLX | |||
| Binary | 1000001002 | |||
| Ternary | 1001223 | |||
| Quaternary | 100104 | |||
| Quinary | 20205 | |||
| Senary | 11126 | |||
| Octal | 4048 | |||
| Duodecimal | 19812 | |||
| Hexadecimal | 10416 | |||
| Vigesimal | D020 | |||
| Base 36 | 7836 | |||
260 (two hundred [and] sixty) is the natural number following 259 and preceding 261.
It is also the magic constant of the n×n normal magic square and n-queens problem for n = 8, the size of an actual chess board.
260 is also the magic constant of the Franklin magic square devised by Benjamin Franklin.
The minor diagonal gives 260, and in addition a number of combinations of two half diagonals of four numbers from a corner to the center give 260.
260 may also refer to the years AD 260 and 260 BC.
262 = 2·131, meandric number, open meandric number, untouchable number, happy number, palindrome number, semiprime
263 is a prime, safe prime, happy number, sum of five consecutive primes (43 + 47 + 53 + 59 + 61), balanced prime, Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number, Bernoulli irregular prime, Euler irregular prime, Gaussian prime, full reptend prime, Solinas prime, Ramanujan prime.
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Wikipedia