Least number k such that 2*k*n + 1 is a prime dividing 3^n + 1.

Terms

a(0) =1a(1) =1a(2) =5a(3) =6a(4) =6a(5) =39a(6) =1a(7) =1a(8) =59a(9) =3a(10) =270a(11) =15330a(12) =1a(13) =1a(14) =672605a(15) =3a(16) =2a(17) =75a(18) =1a(19) =1a(20) =125a(21) =511647711a(22) =2a(23) =3a(24) =1a(25) =360a(26) =7691a(27) =9a(28) =796056a(29) =111