Twin lucky numbers (lower terms).

Terms

a(0) =1a(1) =7a(2) =13a(3) =31a(4) =49a(5) =67a(6) =73a(7) =127a(8) =133a(9) =169a(10) =193a(11) =235a(12) =259a(13) =283a(14) =319a(15) =391a(16) =427a(17) =475a(18) =487a(19) =517a(20) =535a(21) =577a(22) =613a(23) =619a(24) =643a(25) =727a(26) =739a(27) =883a(28) =895a(29) =925