524948

Appears in sequences

• Numbers k such that F(2*k + 1) is prime where F(m) is a Fibonacci number.at n=42A117517
• a(n) = sum(d divides n, 2^(n/d-1) - 1 ), omitting d=1 and d=n.at n=39A137323
• Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 3,3 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155361