Nonsquare numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.

A355707

Nonsquare numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.

Terms

    a(0) =786432a(1) =3500658a(2) =41641938a(3) =75031250a(4) =121773618a(5) =175781250a(6) =408008178a(7) =892531250a(8) =1031215698

External references