I like your test suite. Using large X forces a better solution.
Thank you Jonathan. I have discovered this philosophy thanks to James and @bmtran problems.
is there any mathematical algorithm that i dont know about to calculate such big range(10^13)?
i minimized my code as best as i can.still fails for such large number.
Back to basics 14 - Keywords
Sum of first n terms of a harmonic progression
Return the first and last characters of a character array
How long is the longest prime diagonal?
Number of digits in an integer
Permute diagonal and antidiagonal
Pandigital number n°3 (Inspired by Project Euler 32)
Numbers spiral diagonals (Part 1)
Find files with extension ext in the current directory
Chess ELO rating system
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