Five Consecutive Positive integers Satisfying
i ) The sum of all Numbers is CUBE
ii ) The sum of three Mid Numbers is SQUARE
Find The smallest Possible Value of Mid Number ?
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Let the integers be ( x − 2 ) ( x − 1 ) x ( x + 1 ) ( x + 2 ) . A , B ∈ Z + , s o t h a t 5 x = A 3 . . . i ) a n d 3 x = B 2 . . . i i ) ⟹ 5 A 3 = x = 3 B 2 This is possible only if 5 3 ∗ A 3 = B 2 . So if A contains 3, 3 ∗ 3 3 = 9 2 . If A contains 5, 5 5 3 = 5 2 . ∴ 5 X = 3 3 ∗ 5 3 . ⟹ x = 2 7 ∗ 2 5 = 6 7 5 . x is the Middle Number and 3, and 5 are the smallest possible integers. So the Middle Number has a value of 6 7 5 I got this value first through TI-83 calculator by repeatedly getting 1 + x S T R x : 5 3 ∗ x 3 till I got an integer as the result. x is set to 0 to start with.