Numbers n such that 8*10^n + 6*R_n - 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

A103087

Numbers n such that 8*10^n + 6*R_n - 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =3a(4) =13a(5) =19a(6) =62a(7) =80a(8) =126a(9) =168a(10) =195a(11) =309a(12) =410a(13) =481a(14) =608a(15) =741a(16) =879a(17) =1176a(18) =2688a(19) =6236a(20) =16294a(21) =17317a(22) =31574a(23) =34861a(24) =35392a(25) =48726

External references