260 (number)

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.

Other numbers from 261 to 269

Two hundred [and] sixty-one 261 = 3²·29, nonagonal number, Harshad number----Two hundred [and] sixty-one 261 is the number of possible unfolded tesseract patterns----Two hundred [and] sixty-two 262 = 2·131, meandric number, open meandric number, untouchable number----Two hundred [and] sixty-three 263 prime, safe prime, sum of five consecutive primes (43 + 47 + 53 + 59 + 61), balanced prime, Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number----Two hundred [and] sixty-four 264 = 2³·3·11, Harshad number----Two hundred [and] sixty-five 265 = 5·53, Padovan number, centered square number, Smith number, subfactorial 6. It's the 666th decimal of Pi in base 666, making it a hyper-evil number.----Two hundred [and] sixty-six 266 = 2·7·19, sphenic number, Harshad number, nontotient, noncototient, self number, repdigit in base 11 (222).----Two hundred [and] sixty-seven 267 = 3·89, the number of groups of order 64, see [http://www-public.tu-bs.de:8080/~beick/soft/small/small.html] .----Two hundred [and] sixty-eight 268 = 2²·67, noncototient, untouchable number----Two hundred [and] sixty-nine 269 prime, twin prime with 271, sum of three consecutive primes (83 + 89 + 97), Chen prime, Eisenstein prime with no imaginary part, highly cototient number, strictly non-palindromic number