15 lines
850 B
YAML
15 lines
850 B
YAML
title: Coded triangle numbers
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url: http://projecteuler.net/problem=42
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desc: |
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The nth term of the sequence of triangle numbers is given by, tn = 0.5n(n+1); so the first ten triangle numbers are:
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1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...
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By converting each letter in a word to a number corresponding to its alphabetical position and adding these values we form a word value. For example, the word value for SKY is 19 + 11 + 25 = 55 = t10. If the word value is a triangle number then we shall call the word a triangle word.
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Using words.txt (right click and 'Save Link/Target As...'), a 16K text file containing nearly two-thousand common English words, how many are triangle words?
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solution: Bruteforce
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solutions:
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solve.php:
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desc: Expects data on STDIN
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language: php
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parameters: < ProjectEuler\042\words.txt |