Consider the 2nd, 3rd and 4th diagonals of the Pascal's Triangle, shown highlighted below:
We can see that on the 2nd, 3rd, 4th, 5th and 10th rows, the highlighted diagonals contains at least one perfect square elements:
  • 2nd Diagonal:
  • 3rd Diagonal:
  • 4th Diagonal:
Given a row limit r, write a function that outputs a set of row numbers , in which the 2nd, 3rd and 4th diagonals of the pascal's triangle contains at least one perfect square elements.
In the case above where , the function should return .
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Last Solution submitted on May 05, 2026

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