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Not too much (Posted on 2015-02-20) Difficulty: 2 of 5
What is the sum of the reciprocals of all the nonzero
triangular numbers?

No Solution Yet Submitted by Ady TZIDON    
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Hints/Tips re: Is this valid? no ! - partial spoiler | Comment 3 of 8 |
(In reply to Is this valid? by Jer)

-erroneous text erased-

The sum is  2.

Edited on February 21, 2015, 2:12 pm
  Posted by Ady TZIDON on 2015-02-20 11:00:23

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