A201459 - OEIS

A201459

Least k such that (7^n - k)*7^n - 1 is a prime number.

1, 1, 5, 7, 7, 11, 5, 29, 13, 29, 5, 1, 77, 1, 13, 101, 65, 77, 175, 29, 77, 121, 49, 23, 41, 31, 613, 101, 13, 37, 127, 47, 197, 31, 107, 97, 275, 17, 619, 47, 7, 199, 85, 31, 47, 17, 97, 253, 17, 37, 5, 103, 215, 119, 335, 257, 277, 121, 313, 89, 157, 187, 25, 7, 571, 11, 197, 53, 13, 101, 49, 199, 67, 389, 109, 13, 25, 41, 337, 647, 77