A001390 Smallest multiplicative generator for quadratic residues mod p, p prime.

1, 1, 4, 2, 3, 4, 2, 4, 2, 4, 7, 3, 2, 9, 2, 4, 3, 4, 4, 2, 6, 2, 3, 5, 2, 4, 2, 3, 12, 9, 9, 3, 2, 4, 4, 5, 3, 4, 2, 4, 3, 4, 2, 2, 4, 2, 4, 9, 3, 5, 7, 2, 3, 3, 9, 2, 4, 2, 7, 5, 6, 4, 7, 2, 2, 4, 5, 3, 3, 3, 9, 2, 2, 3, 4, 2, 4, 3, 2, 2, 3, 4, 5, 6, 5, 3, 2, 3, 4, 2, 3, 2, 2, 4, 5, 2, 4, 2, 4, 4, 4, 4, 3, 2, 5, 17