a(n) is the smallest natural number m such that n^m + m is prime.

Terms

a(0) =2a(1) =1a(2) =1a(3) =2a(4) =1a(5) =7954a(6) =1a(7) =34a(8) =101a(9) =2a(10) =1a(11) =1181716a(12) =1a(13) =54a(14) =17a(15) =2a(16) =1a(17) =1080a(18) =1a(19) =57910a(20) =9a(21) =2a(22) =1a(23) =202a(24) =2075a(25) =5538a(26) =3