Numbers k such that 5*10^k + 23 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =11a(6) =15a(7) =43a(8) =51a(9) =110a(10) =164a(11) =303a(12) =824a(13) =3160a(14) =4994a(15) =8596a(16) =11717a(17) =22370a(18) =22600a(19) =65509a(20) =117205a(21) =149907