140283

Appears in sequences

• Numbers k such that Sum_{d|k} sigma(d)^3/d is an integer, where d are the divisors of k.at n=15A226566
• Numbers n such that sigma(Rev(phi(n))) = phi(Rev(sigma(n))), where sigma is the sum of divisors and phi the Euler totient function.at n=21A252255
• Expansion of e.g.f. exp(x) * log(sec(x)).at n=10A354519