26668

Appears in sequences

• Indices of primes in sequence defined by A(0) = 29, A(n) = 10*A(n-1) - 81 for n > 0.at n=8A101952
• a(n) = Sum {k + j*m <= n} (k + j*m), with 0 < k,j,m <= n.at n=29A106847
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^4*A(-x).at n=7A143549
• Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1+x)/(1-5*x-2*x^2).at n=6A180037
• Number of "semiperiodic" binary words of length n.at n=19A209284
• Number of compositions (ordered partitions) of n into tetrahedral (or triangular pyramidal) numbers (A000292).at n=32A282582
• Triangle read by rows, 1 <= k <= n: T(n,k) is the number of (unlabeled) connected graphs with n nodes and zero forcing number k.at n=51A343648
• a(n) = prime(n)*(prime(n-1) + prime(n+1)).at n=28A357679
• Expansion of g.f. C(x*C(x)^3), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).at n=7A363308