23578

Appears in sequences

• Length of period of the continued fraction expansion of sqrt(2^n+1).at n=31A059926
• Length of period of continued fraction expansion of square root of (2^(2n+1)+1).at n=15A061682
• (2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5.at n=20A093472
• a(n) = n^3 - 4*n^2 + 6*n - 2.at n=27A188377
• Number of (n+1)X3 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=2A205209
• Number of (n+1)X4 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=1A205210
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=7A205215
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=8A205215
• Smaller of two consecutive semiprimes which are anagrams of each other.at n=9A228135
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 387", based on the 5-celled von Neumann neighborhood.at n=33A271545
• Erroneous version of A271811 (but for odd primes only).at n=20A271664
• Number A(n,k) of length-n restricted growth strings (RGS) with growth <= k and first element in [k]; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=50A306024
• Number of length-n restricted growth strings (RGS) with growth <= four and first element in [4].at n=5A306028
• Number of unlabeled rooted identity trees with n non-binary nodes.at n=24A318520