Numbers k such that 128 * 3^k - 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =13a(5) =25a(6) =32a(7) =36a(8) =53a(9) =104a(10) =146a(11) =212a(12) =213a(13) =305a(14) =396a(15) =636a(16) =901a(17) =4050a(18) =4778a(19) =4881a(20) =4982a(21) =5084a(22) =8821a(23) =10649a(24) =11685a(25) =13028a(26) =16340a(27) =29096a(28) =44480a(29) =56628