Numbers k such that (44*10^k - 161)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =10a(4) =81a(5) =135a(6) =217a(7) =232a(8) =247a(9) =250a(10) =325a(11) =579a(12) =955a(13) =1288a(14) =1522a(15) =1839a(16) =2794a(17) =15658a(18) =15777a(19) =54547a(20) =63790