67664

Appears in sequences

• Numbers n such that 4*10^n + 7*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=8A102996
• Product_{n>=1} (1 + x^n)^(a(n)/n!) = 1 + sin(x).at n=9A354171
• Inverse permutation to A386932.at n=45A387024