61206

Appears in sequences

• Composite numbers k such that sigma(k) / d(k) is prime.at n=32A048969
• usigma(n) = 2n + d(n), where d(n) is the number of divisors of n.at n=24A063829
• Number of ascent sequences of length n with the maximal number of descents.at n=23A241881
• 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=29A322609