92004

Appears in sequences

• Numbers k such that phi(k) and sigma(k) are both perfect squares.at n=26A067781
• a(n) = 4*n*(n^2 + 2)/3.at n=41A217873
• Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(2*k)) * (1 + x^(3*k)) * (1 + x^(4*k)) * (1 + x^(5*k)).at n=38A327047
• Expansion of e.g.f. (exp(x)-1)^2*(x+x^2/2).at n=12A360588