Numbers k such that phi(k) = sigma(phi(phi(k))).

Terms

a(0) =1a(1) =2a(2) =29a(3) =58a(4) =1119a(5) =1492a(6) =2238a(7) =20441a(8) =20803a(9) =40882a(10) =41606a(11) =550339a(12) =550687a(13) =552407a(14) =553339a(15) =557239a(16) =568487a(17) =573319a(18) =579367a(19) =581279a(20) =584039a(21) =589399a(22) =593959a(23) =644959a(24) =646303a(25) =653317a(26) =655879a(27) =669599a(28) =676837a(29) =823311