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

A237613

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

Terms

    a(0) =1a(1) =4a(2) =9a(3) =25a(4) =81a(5) =289a(6) =1681a(7) =3481a(8) =5041a(9) =7921a(10) =10201a(11) =17161a(12) =27889a(13) =29929a(14) =85849a(15) =146689a(16) =331776a(17) =458329a(18) =491401a(19) =552049a(20) =579121a(21) =597529a(22) =683929a(23) =703921a(24) =734449a(25) =786432a(26) =829921a(27) =1190281a(28) =1203409a(29) =1352569

External references