Numbers k such that 111*2^k-1 is prime.

Terms

a(0) =2a(1) =3a(2) =6a(3) =7a(4) =21a(5) =22a(6) =23a(7) =26a(8) =29a(9) =31a(10) =58a(11) =59a(12) =67a(13) =78a(14) =83a(15) =146a(16) =159a(17) =162a(18) =165a(19) =183a(20) =262a(21) =511a(22) =718a(23) =815a(24) =1181a(25) =1255a(26) =1422a(27) =1506a(28) =1541a(29) =1734