What's this number ? This number is a square number , a multiple of 3 and one more than a cube number . Thank you !!!!!!!!!!!

1 Answer
May 22, 2018

Well, you can probably brute force this...

Some square numbers are:

#x^2 = 1, 4, 9, 16, 25, 36, 49, 64, 81, 100#

  • Of these, the only ones that are multiples of #3# are #9#, #36#, and #81#. Their digits add up to a number divisible by #3#.
  • #9# is one more than #2^3 = 8#, and neither #36# nor #81# fit this condition. #35# is not a perfect cube and neither is #80#.

Therefore, #x = 9# is your number.