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

Terms

a(0) =1a(1) =2a(2) =6a(3) =10a(4) =18a(5) =40a(6) =46a(7) =86a(8) =118a(9) =170a(10) =1172a(11) =1698a(12) =1810a(13) =2268a(14) =4338a(15) =18362a(16) =72662a(17) =88392a(18) =94110a(19) =161538a(20) =168660a(21) =292340a(22) =401208a(23) =560750a(24) =1035092