perplexus.info :: Just Math : Quarting the cube

Quarting the cube (Posted on 2013-02-28)

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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Subject	Author	Date
re(2): SOLUTION +some add-ons	Ady TZIDON	2013-03-02 07:25:51
re: SOLUTION +some add-ons	broll	2013-03-02 06:22:23
re: computer exploration shows likely true -- no proof	Ady TZIDON	2013-03-01 21:24:39
SOLUTION +some add-ons	Ady TZIDON	2013-03-01 21:18:12
Solution - no cube spotted	Jer	2013-03-01 09:22:59
computer exploration shows likely true -- no proof	Charlie	2013-02-28 16:51:58

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