76614

Appears in sequences

• usigma(n) = 2n + d(n), where d(n) is the number of divisors of n.at n=28A063829
• a(1) = 1; for n > 1, a(n) is the least k > a(n-1) such that a(n) + a(n-1) is square and a(n) - a(n-1) is prime.at n=36A108972
• Numbers k such that s(k) = 2*k, where s(k) is the sum of divisors of k that have a square factor (A162296).at n=33A322609
• Primitive terms of A051487.at n=31A346694