a(n) is the least number k such that k*n+1 is a prime dividing n^n+1.

Terms

a(0) =2a(1) =2a(2) =64a(3) =104a(4) =2a(5) =16a(6) =12a(7) =8a(8) =10a(9) =2a(10) =16a(11) =1032a(12) =2a(13) =2a(14) =17136a(16) =2a(17) =5700a(18) =7436a(19) =16a(20) =437174342164a(21) =2a(22) =1392a(23) =9568a(24) =2a(25) =6a(26) =16a(27) =8a(28) =2a(29) =12a(30) =20