Your test case doesn't match up with the problem statement. The problem statement mentions monotonically decreasing, while the test case tests for just decreasing.
Project Euler: Problem 6, Natural numbers, squares and sums.
~~~~~~~ WAVE ~~~~~~~~~
Dimensions of a rectangle
Can the given sides form a triangle?
Number Puzzles - 005
Calculating Ring Area
Number Puzzle - 109
Number Puzzle - 077
Matrix Pattern 8
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