4 and 9
25 and 26
30 and 49
98 and 99
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There is no one person who invented it there are several people who had contributed.
There are several prime numbers that add up to 144 and of it is 71+73 =144
196 is not a prime number; it is divisible by several numbers such as 2, 4, and others.
There are several combinations, but this is one: 23 + 29 = 52.
There are several possibilities of pairs of numbers whose greatest common factor is 18. 54 and 198 18 and 126 414 and 846 72 and 1422