Numbers k such that 10*(11*10^k-1) + 3 is prime or PRP.

Terms

a(0) =1a(1) =2a(2) =6a(3) =14a(4) =42a(5) =44a(6) =47a(7) =50a(8) =118a(9) =119a(10) =178a(11) =223a(12) =367a(13) =438a(14) =872a(15) =1378a(16) =2076a(17) =2352a(18) =4195a(19) =5090a(20) =15905a(21) =17454