Numbers k such that k + 1 divides 3^k + 1.

Terms

a(0) =0a(1) =1a(2) =3a(3) =27a(4) =531a(5) =1035a(6) =4635a(7) =6363a(8) =11475a(9) =19683a(10) =40131a(11) =80955a(12) =266475a(13) =280755a(14) =307395a(15) =356643a(16) =490371a(17) =544347a(18) =557955a(19) =565515a(20) =572715a(21) =808227a(22) =1256355a(23) =1695483a(24) =1959075a(25) =1995075a(26) =2771595a(27) =2837835a(28) =3004155a(29) =3208491