This puzzle is based off and inspired by the What is a Word™ and What is a Phrase™ series started by JLee and their spin-off What is a Number™ series.

This was originally going to be a challenge for Code Golf SE, but first I wanted to see whether someone can figure it out without me telling so.

If a number conforms to a special rule, I call it a Sharp Number™. Find whether a number is "sharp".

Sharp Numbers™ Non-Sharp Numbers™
4 1
7 2
37 20
62 22
81 42
439 863
482 5364
2745 123456789

Note that each of the numbers can be tested individually; there is no pattern among different Sharp Numbers™


why is the flat log of the parts

Hint 2:

don't fall down the axis!

  • $\begingroup$ Is it possible that you can put this in ascending or descending order, or does this jumble of numbers part of the puzzle? $\endgroup$
    – Varun W.
    Mar 7 at 4:58
  • $\begingroup$ @VarunW. No, as I said there is no relation among the different Sharp Numbers™ $\endgroup$
    – Seggan
    Mar 7 at 16:39
  • $\begingroup$ So this puzzle is not like an input and output puzzle? $\endgroup$
    – Varun W.
    Mar 7 at 17:56
  • $\begingroup$ This puzzle is whether a number fits a certain rule $\endgroup$
    – Seggan
    Mar 7 at 17:56
  • 1
    $\begingroup$ @Prim3numbah correct. they are sharp (ignore my deleted comment) $\endgroup$
    – Seggan
    May 18 at 14:05


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