21887

Appears in sequences

• Numbers whose base-5 representation contains exactly three 0's and three 2's.at n=20A045187
• a(n) = ceiling(sqrt(n!)).at n=12A055228
• a(n) = index of first appearance of n in A096862.at n=17A097008
• a(n) = 38*n^2 - 1.at n=23A158596
• a(1)= 1; a(2)= 5; thereafter a(n)= a(n-1) + a(n-2) + 5.at n=17A166863
• Decimal representation of the n-th iteration of the "Rule 141" elementary cellular automaton starting with a single ON (black) cell.at n=8A267527
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 513", based on the 5-celled von Neumann neighborhood.at n=14A288812
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 771", based on the 5-celled von Neumann neighborhood.at n=14A290231