Numbers k such that 5*2^k - 1 is prime.

Terms

a(0) =2a(1) =4a(2) =8a(3) =10a(4) =12a(5) =14a(6) =18a(7) =32a(8) =48a(9) =54a(10) =72a(11) =148a(12) =184a(13) =248a(14) =270a(15) =274a(16) =420a(17) =1340a(18) =1438a(19) =1522a(20) =1638a(21) =1754a(22) =1884a(23) =2014a(24) =2170a(25) =2548a(26) =2622a(27) =2652a(28) =2704a(29) =13510