Numbers k such that (16*10^k - 19)/3 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =6a(4) =10a(5) =13a(6) =20a(7) =22a(8) =24a(9) =35a(10) =41a(11) =42a(12) =46a(13) =155a(14) =222a(15) =336a(16) =432a(17) =538a(18) =577a(19) =637a(20) =679a(21) =750a(22) =758a(23) =785a(24) =2262a(25) =5436a(26) =6806a(27) =7962a(28) =9757a(29) =16016