Numbers k such that phi(k) = tau(k)^4, where tau(k) = A000005(k).

Terms

a(0) =1a(1) =17a(2) =514a(3) =8738a(4) =32301a(5) =33003a(6) =36351a(7) =41504a(8) =42292a(9) =43852a(10) =51860a(11) =62226a(12) =549117a(13) =561051a(14) =571311a(15) =599067a(16) =617967a(17) =629811a(18) =634005a(19) =657495a(20) =673184a(21) =674505a(22) =683168a(23) =701024a(24) =705568a(25) =718964a(26) =722684a(27) =732628a(28) =745484a(29) =759772