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A comment on Testing for Divisibility by 19. Parent comment
20 * 2 === 40 === 2 (mod 19)
21 * 2 === 42 === 4 (mod 19)
18 * 2 === 36 === 17 (mod 19), equivalently -1 * 2 === -2 === 17 (mod 19)
10 * 2 === 20 === 1 (mod 19), equivalently -9 * 2 === -18 === 1 (mod 19)
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20 * 2 === 40 === 2 (mod 19)
21 * 2 === 42 === 4 (mod 19)
18 * 2 === 36 === 17 (mod 19), equivalently -1 * 2 === -2 === 17 (mod 19)
10 * 2 === 20 === 1 (mod 19), equivalently -9 * 2 === -18 === 1 (mod 19)