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Quarting the cube (Posted on 2013-02-28) Difficulty: 3 of 5

Select integer x and triangular number y such that 8y=3x^4-2x^2-1.

Prove that y is divisible by 28 - or find a counter-example.

See The Solution Submitted by broll    
Rating: 5.0000 (2 votes)

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Some Thoughts re(2): SOLUTION +some add-ons Comment 6 of 6 |
(In reply to re: SOLUTION +some add-ons by broll)

Mr Broll, Esq

 It is implicit indeed, but passed unnoticed.
I liked this problem very much - it forced me to go down the memory lane all the way  to Recursion Avenue..

Cheers!

  Posted by Ady TZIDON on 2013-03-02 07:25:51
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