109160

Appears in sequences

• Expansion of (1/theta_4(q)^2 -1)/4 in powers of q.at n=18A002318
• Prime(n) divides F(n)-1 where F(n) are the Fibonacci numbers.at n=9A071777
• Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 9.at n=9A136871
• Number of 7-element subsets of [n] whose sum is a triangular number.at n=22A320853
• Triangle read by rows: Take a pentagram with all diagonals drawn, as in A331906. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+2.at n=34A331907