Numbers k such that k | 4^k + 2^k + 1.

Terms

a(0) =1a(1) =7a(2) =49a(3) =343a(4) =2359a(5) =2401a(6) =16513a(7) =16807a(8) =115591a(9) =117649a(10) =794983a(11) =809137a(12) =8235433a(13) =5564881a(14) =5663959a(15) =5764801a(16) =38954167a(17) =39647713a(18) =40353607a(19) =100170217a(20) =267909271a(21) =272679169a(22) =277533991a(23) =282475249a(24) =701191519a(25) =1636091527a(26) =1875364897a(27) =1908754183a(28) =1942737937a(29) =1977326743