A birthday puzzle

Today is my birthday.

Being a mathematician,  I pulled out as many pennies as my age.   I noted that if I arranged the pennies in a rectangular array, they formed a perfect square.

I then noted that I could also rearrange the same pennies in a hexagonal array to form an equilateral triangle.

I don’t think I’ve ever been able to do that before.

How old am I?

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One Response to A birthday puzzle

  1. Pinki says:

    36. 😀 It’s 6*6 and the sum of the numbers from 1-8 (I hope that’s how a hexagonal array is arranged!). Interesting problem!

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twenty six − = 23