Numbers k such that 3*k+1 is prime.

Terms

a(0) =2a(1) =4a(2) =6a(3) =10a(4) =12a(5) =14a(6) =20a(7) =22a(8) =24a(9) =26a(10) =32a(11) =34a(12) =36a(13) =42a(14) =46a(15) =50a(16) =52a(17) =54a(18) =60a(19) =64a(20) =66a(21) =70a(22) =74a(23) =76a(24) =80a(25) =90a(26) =92a(27) =94a(28) =102a(29) =104