45840

Appears in sequences

• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=14A005353
• Abundant numbers n such that n = sigma(k) - 2k, where k = sigma(n) - 2n.at n=2A069085
• Number of configurations of the 5 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.at n=43A090036
• Structured triakis octahedral numbers (vertex structure 4).at n=23A100171
• Let S(n)=sigma(|n|)-2*n; sequence gives numbers n such that S(S(S(S(n))))=n. May be called {2,1}-Sociable number of orders 1 or 2 or 4.at n=9A113285
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 1), (-1, 0, 1), (0, 1, 0), (1, 1, 0)}.at n=9A150056
• a(n) = number of primes p, p <= 2^n, where 2^n + p is prime.at n=23A175147
• Numbers k such that (2^k + 3)^2 - 8 is prime.at n=36A188936
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and no two consecutive zero elements.at n=19A199531
• a(n) = Sum of (Y(2,p)^2) over the partitions p of n, Y(2,p) = number of part sizes with multiplicity 2 or greater in p.at n=33A302347
• a(n) is the permanent of an n X n symmetric Toeplitz matrix M(n) whose first row consists of a single zero followed by successive positive integers repeated (A004526).at n=7A332566
• Consecutive states of the linear congruential pseudo-random number generator 254*s mod (2^16+1) when started at s=1.at n=24A384934