perplexus.info :: Just Math : Prime and Twice Square

Prime and Twice Square (Posted on 2016-10-22)

Determine all possible values of a prime number P such that each of P+1 and P² + 1 is twice a perfect square.

Prove that these are the only ones.

Submitted by K Sengupta

Rating: 4.0000 (3 votes)

Solution: (Hide)

P=7 is the sole answer to the given puzzle.
For an explanation, refer to the solution submitted by broll in this location.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Possible solution.	broll	2016-10-23 22:37:56
re: A solution	Charlie	2016-10-22 15:54:41
re: A solution................all possible values?	Ady TZIDON	2016-10-22 13:21:21
A solution	Math Man	2016-10-22 11:49:50

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