Numbers k such that k | 6^k + 1.

Terms

a(0) =1a(1) =7a(2) =49a(3) =203a(4) =343a(5) =1379a(6) =1421a(7) =2401a(8) =5887a(9) =9653a(10) =9947a(11) =11977a(12) =16807a(13) =39991a(14) =41209a(15) =67571a(16) =69629a(17) =83839a(18) =117649a(19) =170723a(20) =271663a(21) =279937a(22) =288463a(23) =347333a(24) =472997a(25) =487403a(26) =586873a(27) =706643a(28) =823543a(29) =1159739