Odd numbers k that divide 25^k - 1.

Terms

a(0) =1a(1) =3a(2) =9a(3) =21a(4) =27a(5) =63a(6) =81a(7) =93a(8) =147a(9) =171a(10) =189a(11) =243a(12) =279a(13) =441a(14) =513a(15) =567a(16) =609a(17) =651a(18) =729a(19) =837a(20) =903a(21) =1029a(22) =1197a(23) =1323a(24) =1539a(25) =1701a(26) =1827a(27) =1953a(28) =2187a(29) =2511