Numbers k such that (4*10^k + 137)/3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =8a(5) =13a(6) =18a(7) =31a(8) =42a(9) =43a(10) =48a(11) =53a(12) =210a(13) =792a(14) =1324a(15) =1868a(16) =2544a(17) =5609a(18) =10210a(19) =10514a(20) =11232a(21) =14731a(22) =36583a(23) =50060a(24) =128510a(25) =198268