106380

Appears in sequences

• Numbers k such that (2^k + 1)^2 - 2 = 4^k + 2^(k+1) - 1 is prime.at n=42A091513
• Numbers n such that sigma(sigma(n))/sigma(n) > sigma(sigma(m))/sigma(m) for all m < n.at n=29A289124
• Number of ways to write n as an ordered sum of ten powers of 2.at n=29A342254
• a(n) = Sum_{k=0..n} 8^k * binomial(2*n,n-k).at n=5A386960