128412

Appears in sequences

• Numbers whose sum of nonunitary divisors and sum of unitary divisors are both positive squares.at n=2A064730
• Numbers k such that phi(k) = Sum_{d|k} core(d) where core(x) is the squarefree part of x (A007913).at n=21A074786
• Expansion of f(-x, -x^7) / f(-x, -x) in powers of q where f(, ) is Ramanujan's general theta function.at n=40A132212