51860

Appears in sequences

• Numbers k such that phi(k) = tau(k)^4, where tau(k) = A000005(k).at n=10A114063
• Triangle read by rows: T(n,k), n>=1, k>=1, in which column k lists the numbers of A210843 multiplied by A000330(k), and the first element of column k is in row A000217(k).at n=37A249120