I'm a number. The difference between me and my checksum is 36 and I am the product of two adjacent numbers. Which number am I?

I know it's pretty simple but one that just came to my mind right now =D


1 Answer 1


I think you are



$42 - 4 - 2 = 36$


$42 = 6 \times 7$


It suffices to check the first few numbers which are the product of adjacent integers as the number itself grows much faster than the checksum and will surpass $36$ early on.

  • $\begingroup$ Correct! Congrats =) $\endgroup$
    – JohnyDoe
    Apr 27, 2018 at 9:15
  • 1
    $\begingroup$ I would like to add that if the difference between a number and its checksum is 36 you can now that the number will be between 40 and 49 . $\endgroup$
    – JohnyDoe
    Apr 27, 2018 at 13:54

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