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An Octagonal Problem (Posted on 2006-06-13) Difficulty: 3 of 5
An octagonal number is a number that is represented by the set of figures given below.

A certain octagonal number is the sum of the squares of three terms in an arithmetic sequence with a common difference of 704. What is that octagonal number?

See The Solution Submitted by K Sengupta    
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  Subject Author Date
Solutionre: For starters -- computer solution (spoiler)Charlie2006-06-13 11:07:39
Some ThoughtsFor starterse.g.2006-06-13 09:56:52
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