71622369

Appears in sequences

• Numerator of probability that the height of a rooted random binary tree is n.at n=4A187131
• Odd squares which are the sum of the divisors of some n.at n=11A243810
• a(n) is the smallest integer k > n such that sqrt(1/n + 1/k) is a rational number; or 0 if no such k exists.at n=30A379815