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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)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some Thoughtsre(2): SOLUTION +some add-onsAdy TZIDON2013-03-02 07:25:51
re: SOLUTION +some add-onsbroll2013-03-02 06:22:23
Some Thoughtsre: computer exploration shows likely true -- no proofAdy TZIDON2013-03-01 21:24:39
SolutionSOLUTION +some add-onsAdy TZIDON2013-03-01 21:18:12
Solution - no cube spottedJer2013-03-01 09:22:59
Some Thoughtscomputer exploration shows likely true -- no proofCharlie2013-02-28 16:51:58
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