Divisible only by primes congruent to 6 mod 7.

Terms

a(0) =1a(1) =13a(2) =41a(3) =83a(4) =97a(5) =139a(6) =167a(7) =169a(8) =181a(9) =223a(10) =251a(11) =293a(12) =307a(13) =349a(14) =419a(15) =433a(16) =461a(17) =503a(18) =533a(19) =587a(20) =601a(21) =643a(22) =727a(23) =769a(24) =797a(25) =811a(26) =839a(27) =853a(28) =881a(29) =937