Numbers k such that 2^k + 5*k is a prime.

Terms

a(0) =1a(1) =3a(2) =7a(3) =9a(4) =15a(5) =21a(6) =33a(7) =37a(8) =61a(9) =141a(10) =159a(11) =229a(12) =345a(13) =373a(14) =511a(15) =717a(16) =2065a(17) =2337a(18) =15619a(19) =22771a(20) =22875a(21) =23911a(22) =29323a(23) =53025a(24) =106363a(25) =127077