21645

Appears in sequences

• Number of multigraphs with 4 nodes and n edges.at n=33A003082
• Numbers n such that phi(n) + 6 | sigma(n).at n=15A015797
• Total number of prime parts in all partitions of n.at n=29A037032
• Structured disdyakis dodecahedral numbers (vertex structure 7).at n=14A100162
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (1, 0), (1, 1)}.at n=8A151467
• a(n) is the smallest number such that a(n)*n is an anagram of a(n)*5.at n=37A175694
• Number of ways of writing n as the sum of 10 triangular numbers from A000217.at n=14A226254
• Numbers k such that (52*10^k + 119)/9 is prime.at n=20A294229
• Nonprime numbers k of the form 4*m+1 such that Sum_{j=0..k-1} 2^j * binomial(3*j, j) == 1 (mod k).at n=34A373747