Least number k such that k*n^k - 1 is prime. a(n) = 0 if no such number exists.

Terms

a(0) =3a(1) =2a(2) =1a(3) =1a(4) =8a(5) =1a(6) =2a(7) =1a(8) =10a(9) =2a(10) =2a(11) =1a(12) =2a(13) =1a(14) =2a(15) =167a(16) =2a(17) =1a(18) =12a(19) =1a(20) =2a(21) =2a(22) =29028a(23) =1a(24) =2a(25) =3a(26) =10a(27) =2a(28) =26850a(29) =1