Numbers k such that (203*10^k + 1)/3 is prime.

Terms

a(0) =1a(1) =5a(2) =12a(3) =17a(4) =21a(5) =23a(6) =25a(7) =29a(8) =109a(9) =168a(10) =195a(11) =327a(12) =417a(13) =461a(14) =1991a(15) =3512a(16) =3955a(17) =4239a(18) =6228a(19) =24317a(20) =91613a(21) =131457a(22) =152143a(23) =159381a(24) =162689