Numbers k such that k | 5^k + 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =9a(4) =21a(5) =26a(6) =27a(7) =63a(8) =81a(9) =147a(10) =189a(11) =243a(12) =338a(13) =441a(14) =567a(15) =609a(16) =729a(17) =903a(18) =1029a(19) =1323a(20) =1378a(21) =1701a(22) =1827a(23) =2187a(24) =2667a(25) =2709a(26) =3087a(27) =3969a(28) =4263a(29) =4394