1 & 1
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Any two numbers whose product is '1' are each others' reciprocals.
There are infinitely many expressions that simplify to any particular number; for example: any two numbers which, when added, give 24, any two numbers whose difference is 24, any two numbers whose product is 24, etc.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
19
There are no such numbers.