Primes of the form 666*k - 1.

Terms

a(0) =1997a(1) =2663a(2) =3329a(3) =6659a(4) =9323a(5) =11321a(6) =11987a(7) =12653a(8) =16649a(9) =17981a(10) =19979a(11) =21977a(12) =22643a(13) =25307a(14) =29303a(15) =32633a(16) =34631a(17) =35963a(18) =36629a(19) =39293a(20) =41957a(21) =44621a(22) =45953a(23) =46619a(24) =47951a(25) =53279a(26) =59273a(27) =62603a(28) =64601a(29) =65267