67117058

Appears in sequences

• Inverse Moebius transform of the Mersenne numbers: a(n) = Sum_{d|n} (2^d - 1).at n=25A130887
• a(n) = 4^n+2^n+2.at n=13A170938
• a(n) = (Product_{i=1..n-1} (2^i + 1)) modulo (2^n - 1).at n=38A219732