Numbers k such that (28*10^k - 97)/3 is prime.

Terms

a(0) =1a(1) =5a(2) =8a(3) =20a(4) =27a(5) =56a(6) =74a(7) =81a(8) =107a(9) =217a(10) =294a(11) =326a(12) =525a(13) =645a(14) =667a(15) =764a(16) =863a(17) =1885a(18) =1961a(19) =2913a(20) =3056a(21) =3192a(22) =3327a(23) =5480a(24) =8455a(25) =22797a(26) =50147a(27) =89141a(28) =96265