Numbers k such that (379*10^k - 1)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =10a(5) =11a(6) =20a(7) =56a(8) =161a(9) =172a(10) =263a(11) =290a(12) =578a(13) =800a(14) =1166a(15) =3382a(16) =3848a(17) =7036a(18) =10487a(19) =12101a(20) =36211a(21) =94337a(22) =138737