Numbers k such that (47*10^k + 493)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =7a(3) =10a(4) =16a(5) =22a(6) =32a(7) =85a(8) =106a(9) =310a(10) =374a(11) =410a(12) =421a(13) =502a(14) =850a(15) =938a(16) =1213a(17) =2362a(18) =4597a(19) =50578a(20) =59509a(21) =77572a(22) =136141a(23) =174790