Numbers k such that 4*10^k + 49 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =8a(5) =18a(6) =20a(7) =24a(8) =40a(9) =57a(10) =84a(11) =92a(12) =111a(13) =135a(14) =138a(15) =272a(16) =423a(17) =540a(18) =542a(19) =1147a(20) =1246a(21) =1713a(22) =2217a(23) =2767a(24) =3486a(25) =30586a(26) =34183a(27) =61119a(28) =113658a(29) =194668