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Triangular Mystery Cache

Hidden : 12/27/2023
Difficulty:
4 out of 5
Terrain:
4 out of 5

Size: Size:   micro (micro)

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Geocache Description:


In a list of all positive triangular numbers from 1 to 1000000000 inclusive, how many have their digits sum to another triangular number?

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Additional Hints (No hints available.)