Take elliptic curve E: y2 ≡ x3 + 20x + 13 over 17

Reciprocal value table, if needed
x 1 2 3 4 5 6 7 8 9 10
x-1 mod 17 1 9 6 13 7 3 5 15 2 12
x 11 12 13 14 15
x-1 mod 17 14 10 4 11 8