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

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =10a(5) =12a(6) =18a(7) =20a(8) =26a(9) =32a(10) =36a(11) =56a(12) =66a(13) =118a(14) =130a(15) =150a(16) =166a(17) =206a(18) =226a(19) =550a(20) =706a(21) =810a(22) =1136a(23) =1228a(24) =1818a(25) =2368a(26) =2400a(27) =3128a(28) =4532a(29) =5112