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S Jun 10, 2017 at 0:05 history suggested foobar CC BY-SA 3.0
Fixed sign. Added citation to reach 6-character min for edits
Jun 9, 2017 at 23:52 review Suggested edits
S Jun 10, 2017 at 0:05
Dec 12, 2015 at 23:32 comment added Owen If you look through all the results for ones that are 5 times a perfect square, it's only 0, 5 and 20. So that seems to answer the question completely.
S May 27, 2014 at 21:48 history suggested Marco Golla CC BY-SA 3.0
added LaTeX code for formulae, to improve readability
May 27, 2014 at 21:45 review Suggested edits
S May 27, 2014 at 21:48
Apr 7, 2010 at 22:40 comment added Kevin Buzzard [remark: the biggest integer point on either curve is 5*532^3+4=27438^2, but, unfortunately, 532 isn't a square]
Apr 7, 2010 at 22:35 comment added Kevin Buzzard It's really easy to get a computer to find all the integer points on an elliptic curve, as I was just saying the other day at mathoverflow.net/questions/20286/… . Multiply up by 25 and we're looking for integer points to X^3+-100=Y^2 (with X,Y both multiples of 5). Both magma and sage have got this implemented now: you just type "IntegralPoints(EllipticCurve([0,100]));" into magma for one, and change 100 to -100 for the other. Both commands terminate in about 0.2 seconds.
Apr 7, 2010 at 17:45 history edited Alison Miller CC BY-SA 2.5
added 25 characters in body
Oct 22, 2009 at 1:56 history edited Alison Miller CC BY-SA 2.5
added addendum
Oct 21, 2009 at 17:15 history answered Alison Miller CC BY-SA 2.5