Smallest k such that n^k - k is a prime, or 0 if no such number exists.

Terms

a(0) =2a(1) =1a(2) =1a(3) =2a(4) =1a(5) =2a(6) =1a(7) =2a(8) =3a(9) =18a(10) =1a(11) =2a(12) =1a(13) =2a(14) =3a(15) =6a(16) =1a(17) =2a(18) =1a(19) =2a(20) =41a(21) =110a(22) =1a(23) =18a(24) =3a(25) =2a(26) =11a(27) =2a(28) =1a(29) =24