Numbers k such that (4*10^k + 197)/3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =9a(6) =12a(7) =36a(8) =42a(9) =46a(10) =75a(11) =97a(12) =153a(13) =174a(14) =204a(15) =1078a(16) =1306a(17) =1380a(18) =2096a(19) =2401a(20) =3393a(21) =9547a(22) =16650a(23) =41404a(24) =64014