23726566

Appears in sequences

• a(0)=1, a(n+1) = 2*a(n) + b(n+2), where b(n)=A004539(n) is the n-th bit in the binary expansion of sqrt(2).at n=24A084188
• Integers n such that n^2 + k is a Mersenne number 2^m - 1 for some k < n and m odd.at n=13A144932