THE PUZZLET PAGE


PUZZLET 072

Triangular Numbers

The sum of the 120th and 1545th triangular numbers is 1201545.   As you can see, and rather amazingly, the sum is also a concatenation of the index numbers.

Are there any more like this? Use a 3-digit index followed by a 4-digit index,  as in the example.


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Last Updated: January 12th, 2010.