MathCastle
Number TheorySuperchallengeFactors & Multiples

Factors & Multiples · Superchallenge problem

Call a positive integer nn a divisor record if nn has more positive divisors than every positive integer smaller than nn (so 11, 22 and 44 are divisor records, but 33 is not). Find the sum of all divisor records from 11 to 100100.