331731

Appears in sequences

• Numbers k such that phi(k) is equal to A008473(k).at n=26A039779
• Numbers k such that phi(k) = Sum_{d|k} core(d) where core(x) is the squarefree part of x (A007913).at n=26A074786
• Numbers k such that sigma(k)^2 = psi(k)^2 + phi(k)^2.at n=3A389593