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Perhaps this explanation can help you out BestJewSinceJC: The sequence of triangle numbers is generated by adding the natural numbers. So the 7th triangle number would be 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The first ten terms would be: 1, 3, …

Hi everyone, I have a problem with one of the problems (17) that i try to solve on the [URL="http://projecteuler.net"]Project Euler[/URL] site. The problem is as follows: If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + …

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