Numbers k such that 6*5^k - 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =11a(5) =28a(6) =65a(7) =72a(8) =361a(9) =479a(10) =494a(11) =599a(12) =1062a(13) =1094a(14) =1193a(15) =2827a(16) =3271a(17) =3388a(18) =3990a(19) =4418a(20) =11178a(21) =16294a(22) =25176a(23) =42500a(24) =68320a(25) =85698a(26) =145259a(27) =159119a(28) =169771a(29) =252665