31668
domain: N
Appears in sequences
- MacMahon's generalized sum of divisors function.at n=25A002128
- a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=29A011928
- Distinct even elements in the 5-Pascal triangle A028313.at n=35A028320
- Even elements to the right of the central elements of the 5-Pascal triangle A028313.at n=28A028321
- Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=20A080395
- a(n) = (n-1)*n*(n+1)*(n+2)*(2*n+1)/40.at n=14A112851
- Numbers k such that abs(RSA-1536 - 10^k) is prime, where RSA-1536 is the 463 decimal digit RSA challenge number A391940(48).at n=5A113931
- Numbers k such that 5^k mod k = 5^k mod k^2.at n=37A125775
- Numbers k such that k^2 divides 5^k-1.at n=28A127105
- Sums of the products of n consecutive pairs of numbers.at n=28A135036
- a(n) = 2*n*(9*n-1).at n=41A178574
- Number of 0..n arrays x(0..4) of 5 elements with each no smaller than the sum of its three previous neighbors modulo (n+1).at n=11A200669
- Number of n X 7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 1 vertically.at n=12A208779
- Value of concatenation of all suffixes of binary representation of n.at n=30A241426
- Triangle read by rows: convert A323836 from binary to decimal.at n=23A323837
- Numbers k such that psi(k^2) = k, psi = A002322; indices of 1 in A341857.at n=35A341858
- Number of 4-cycles in the n-cycle complement and (n+1)-wheel complement graph.at n=23A367985