110450

Appears in sequences

• Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in cycle of length=11.at n=8A096888
• Numbers k such that sigma(k) + tau(k) + phi(k) is a prime, where sigma(k) = A000203(k), tau(k) = A000005(k) and phi(k) = A000010(k).at n=20A229265