Composite numbers n such that n+2 is also composite and such that (sopfr(n), sopfr(n+2)) is a twin prime pair. A001414 explains notation 'sopfr(n)'.

A247048

Composite numbers n such that n+2 is also composite and such that (sopfr(n), sopfr(n+2)) is a twin prime pair. A001414 explains notation 'sopfr(n)'.

Terms

    a(0) =54a(1) =845a(2) =1083a(3) =37595a(4) =50367a(5) =50898a(6) =101673a(7) =103416a(8) =107909a(9) =112344a(10) =117390a(11) =160020a(12) =172176a(13) =266342a(14) =761926a(15) =839147a(16) =1183488a(17) =1190597a(18) =1629219a(19) =1711950a(20) =1742585a(21) =2247839a(22) =2312190a(23) =2345894a(24) =2372272a(25) =2756502a(26) =3092261a(27) =3679504a(28) =3710280a(29) =4832298

External references