Least number k such that k^n +- k +- 1 is prime for all four possibilities, or 0 if no such k exists.

A248031

Least number k such that k^n +- k +- 1 is prime for all four possibilities, or 0 if no such k exists.

Terms

    a(0) =3a(1) =15a(2) =6a(3) =0a(4) =30594a(5) =246819a(6) =0a(7) =4033590a(8) =2298429a(9) =0a(10) =19209840a(11) =13542816a(12) =0a(13) =3979836a(14) =75524874a(15) =0a(16) =143635866a(17) =220808901a(18) =0a(19) =14557221a(20) =185958081a(21) =0a(22) =180438825a(23) =320588085a(24) =0a(25) =499478574a(26) =29105421a(27) =0a(28) =37340766a(29) =1169275746

External references