Numbers k such that 6*prime(k) -+ {1,5} are all prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =106a(5) =388a(6) =930a(7) =2999a(8) =3127a(9) =3974a(10) =4982a(11) =5154a(12) =6350a(13) =6612a(14) =6750a(15) =7661a(16) =7693a(17) =8783a(18) =10156a(19) =10465a(20) =11989a(21) =13101a(22) =13266a(23) =15349a(24) =15351a(25) =17476a(26) =18087a(27) =19305a(28) =20670a(29) =21434