2118656

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=12A056076
• Numbers k such that sigma(k) + tau(k) = 2k.at n=10A083874
• Numbers of the form 2^n*(2^(n+1)+2n+1) where 2^(n+1)+2n+1 is prime.at n=6A105331
• Numbers n whose deficiency is 22: sigma(n) - 2*n = -22.at n=9A223606