537346048

Appears in sequences

• Numbers k that divide sigma(k) + d(k), where d(k) is the number of divisors of k and sigma(k) is their sum.at n=23A056076
• Numbers k such that sigma(k) + tau(k) = 2k.at n=20A083874
• Numbers of the form 2^n*(2^(n+1)+2n+1) where 2^(n+1)+2n+1 is prime.at n=8A105331
• G.f.: Sum_{n=-oo..+oo} x^n * (sqrt(2) + x^n)^(2*n).at n=29A363561
• Numbers m with deficiency 30: sigma(m) - 2*m = -30.at n=10A389700