# 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,