139954

Appears in sequences

• (1/2)*(n^2+n+2)*(n^2+3*n+1).at n=22A058310
• Numbers k such that phi(k) and sigma(k) are both perfect squares.at n=33A067781
• Numbers n such that phi(n), psi(n) and sigma(n) are simultaneously perfect squares.at n=14A301867