Numbers k such that 10^k + 3 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =11a(5) =17a(6) =18a(7) =39a(8) =56a(9) =101a(10) =105a(11) =107a(12) =123a(13) =413a(14) =426a(15) =2607a(16) =7668a(17) =10470a(18) =11021a(19) =17753a(20) =26927a(21) =60776a(22) =98288a(23) =300476a(24) =509546