Numbers k such that sigma(phi(k)) == phi(sigma(k)) (mod k), that is, A033632(k)/k is an integer.

Terms

a(0) =1a(1) =5a(2) =9a(3) =157a(4) =225a(5) =242a(6) =516a(7) =729a(8) =3872a(9) =13932a(10) =14406a(11) =17672a(12) =18225a(13) =20124a(14) =21780a(15) =29262a(16) =29616a(17) =45996a(18) =65025a(19) =76832a(20) =92778a(21) =95916a(22) =106092a(23) =106308a(24) =114630a(25) =114930a(26) =121872a(27) =125652a(28) =140130a(29) =140625