the number * its reciprocal
i.e 5 * 1/5 = 1, -2 * -1/2 = 1, 3/5 * 5/3 = 1, ...
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reciprocals or multiplicative inverses
Any two numbers whose product is '1' are each others' reciprocals.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
19
There are no such numbers.