56021

Appears in sequences

• Number of n-bead bracelets (turnover necklaces) with 8 red beads and n-8 black beads.at n=20A005514
• Define two sequences by A_n = mex{A_i,B_i : 0 <= i < n} for n >= 0, B_0=0, B_1=1 and for n >= 2, B_n = 2B_{n-1}+(-1)^{A_n}. Sequence gives B_n.at n=16A080241
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 865", based on the 5-celled von Neumann neighborhood.at n=36A273701
• Numbers k such that 15*10^k + 1 is prime.at n=18A295325