If one of or both of the numbers are negative, then yes.
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The sum of all the prime numbers less than 201 is 4,227.
The sum of all prime numbers less than 30 is 129.
210
When the sum of the negatives is an integer is when the sum is a whole number
The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.