25096

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 79.at n=39A031577
• Number of ways to place 3 nonattacking queens on an n X n board.at n=9A047659
• Numbers that reach the fixed point 89 under iteration of f(x) = reverse(x) - maxdigit(x).at n=33A097155
• First differences of A006128.at n=33A138137
• G.f.: exp( Sum_{n>=1} x^n/n * exp( Sum_{k>=1} sigma(n*k) * x^(n*k)/k ) ).at n=17A203320
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^4<x^4+y^4.at n=33A211652
• Number of arrays of maxima of three adjacent elements of some length n+2 0..7 array.at n=5A228460
• Number of arrays of maxima of three adjacent elements of some length 8 0..n array.at n=6A228463
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 177", based on the 5-celled von Neumann neighborhood.at n=32A270620
• Number of nX3 0..1 arrays with exactly n+3-1 having value 1 and no three 1s forming an isosceles right triangle.at n=15A272960
• G.f. A(x) satisfies: A(x) = 1 + Sum_{k>=1} x^k*A(x)^k/(1 + x^k).at n=11A307396
• Number T(n,k) of ways to place k nonattacking queens on an n X n board; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=48A348129