Numbers k such that (26*10^k - 131)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =10a(6) =15a(7) =20a(8) =31a(9) =107a(10) =115a(11) =290a(12) =455a(13) =611a(14) =669a(15) =1190a(16) =2111a(17) =2147a(18) =2821a(19) =4094a(20) =4616a(21) =7087a(22) =7971a(23) =11416a(24) =12413a(25) =21475a(26) =23719a(27) =24435a(28) =32218a(29) =122625