Numbers k such that 3*10^k - 23 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =14a(5) =18a(6) =20a(7) =36a(8) =68a(9) =224a(10) =252a(11) =563a(12) =780a(13) =2430a(14) =3150a(15) =7919a(16) =11092a(17) =14020a(18) =14908a(19) =58032