Numbers k such that (47*10^k + 403)/9 is prime.

Terms

a(0) =1a(1) =4a(2) =10a(3) =12a(4) =16a(5) =28a(6) =42a(7) =108a(8) =127a(9) =664a(10) =744a(11) =781a(12) =3036a(13) =3184a(14) =4753a(15) =5695a(16) =7350a(17) =8592a(18) =8694a(19) =15939a(20) =21822a(21) =24466a(22) =61821a(23) =196281