21555

Appears in sequences

• Every prefix prime in base 6 (written in base 6).at n=25A024766
• Trajectory of 1 under map n->11n+1 if n odd, n->n/2 if n even.at n=17A033963
• Numbers k such that the decimal part of k^(1/6) starts with a 'nine digits' anagram.at n=7A034281
• Trajectory of 3 under map n->11n+1 if n odd, n->n/2 if n even.at n=14A037103
• Numbers k such that phi(m) = 96*k+2 has no solution.at n=6A071624
• Number of nondecreasing strings of numbers x(i=1..8) in -n..n with sum x(i)^3 equal to 0.at n=17A188282
• a(n) = Sum_{i=0..n} digsum_8(i)^3, where digsum_8(i) = A053829(i).at n=53A231682
• Number of maximal irredundant sets in the n X n grid graph.at n=4A290790
• Array read by antidiagonals: T(m,n) = number of maximal irredundant sets in the grid graph P_m X P_n.at n=40A291439
• Number of ways to write a + b + c = d + e = f with {a,b,c,d,e,f} a subset of [n] of size 6 and a < b < c and d < e.at n=42A362717
• Number of unlabeled biconnected graphs on n vertices without 4-cycles or 5-cycles.at n=11A366223
• Indices of prime squares in A381019.at n=18A381095