Problem 44732. Highly divisible triangular number (inspired by Project Euler 12)
Triangular numbers can be calculated by the sum from 1 to n. For example, the first 10 triangular numbers are:
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...
All divisors for each of these numbers are listed below
1: 1 3: 1,3 6: 1,2,3,6 10: 1,2,5,10 15: 1,3,5,15 21: 1,3,7,21 28: 1,2,4,7,14,28 36: 1,2,3,4,6,9,12,18,36 45: 1,3,5,9,15,45 55: 1,5,11,55
Your challenge is to write a function that will return the value of the first triangular number to have over d divisors (d will be passed to your function).
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1 Comment
li haitao
on 7 Nov 2018
Why are so many solutions lost?
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