4 consecutive integers

Can four consecutive integers add up to a perfect cube?

Yes No

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2 solutions

Isaac Wood
Jul 26, 2018

If the smallest integer is n n then the sum of the integers is 4 n + 6 4n+6 and 4 n + 6 2 m o d 4 4n+6 \equiv 2 \mod 4 , but all perfect cubes are 0 , 1 0,1 or 3 ( m o d 4 ) 3 \pmod{4} . So The sum of 4 consecutive integers cannot be a perfect cube.

Let the numbers be n , n + 1 , n + 2 , n + 3 n,n+1,n+2,n+3 . Note that the sum 4 n + 6 = 2 ( 2 n + 3 ) 4n+6 =2(2n+3) has an even factor 2 2 and an odd factor 2 n + 3 2n+3 . Since both have no common factor and 2 2 is not a perfect cube, it can never be a perfect cube. So N o \boxed{No} .

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