Numbers k such that (68*10^k + 7)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =10a(6) =24a(7) =25a(8) =29a(9) =34a(10) =35a(11) =37a(12) =46a(13) =49a(14) =88a(15) =103a(16) =290a(17) =381a(18) =484a(19) =696a(20) =751a(21) =886a(22) =999a(23) =1750a(24) =5062a(25) =6214a(26) =9740a(27) =12558a(28) =16551a(29) =24674