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wu :: forums    riddles    medium (Moderators: Grimbal, towr, Eigenray, SMQ, william wu, ThudnBlunder, Icarus)    x^2 + 3*y^2 « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: x^2 + 3*y^2  (Read 2240 times) Christine Full Member     Posts: 159 x^2 + 3*y^2   « on: Sep 6th, 2013, 8:08am » Quote Modify what are the conditions for an integer N to be expressible as the sum of a square and 3 times a square in two ways   N = x^2 + 3*y^2 = z^2 + 3*w^2   How to generate them? IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy => medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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