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1, 2, 4, 5, 10, 20, 25, 50, 100 217
The odd factors of 70 are: 1, 5, 7, and 35. The sum of these factors is 48.
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48
The sum of these composite numbers, including 100, is 3989.The sum of all numbers between 1 and 100 is 5,050. From this we need to subtract the sum of 1 plus all the prime numbers below 100. The sum of the primes is 1,060. Subtracting (1 + 1060) or 1,061 from 5,050 yields 3,989.