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264 (number)

← 259 260 261 →
Cardinal two hundred sixty
Ordinal 260th
(two hundred and sixtieth)
Factorization 22× 5 × 13
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 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.

261 = 32·29, lucky number, nonagonal number, Harshad number, unique period in base 2, number of possible unfolded tesseract patterns. 261 is the lowest number not to have its own page, this making it a candidate for the lowest Uninteresting Number according to the definition given by Alex Bellos.

262 = 2·131, meandric number, open meandric number, untouchable number, happy number, palindrome number, semiprime

263 has its own article. 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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