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wu :: forums    riddles    hard (Moderators: towr, SMQ, william wu, ThudnBlunder, Eigenray, Icarus, Grimbal)    pq-p-q prime? « Previous topic | Next topic » Pages: 1  Notify of replies Send Topic Print    Author  Topic: pq-p-q prime?  (Read 1534 times) cool_joh Newbie     Gender: Posts: 50 pq-p-q prime?   « on: Jul 19th, 2008, 5:31pm » I have check some pairs of primes (p,q). I found that, in most cases, pq-p-q is prime.   What can you say about this? When is pq-p-q is prime? When is it composite? IP Logged MATH PRO ThudnBlunder wu::riddles Moderator Uberpuzzler The dewdrop slides into the shining Sea     Gender: Posts: 4489 Re: pq-p-q prime?   « Reply #1 on: Jul 19th, 2008, 5:47pm » If this was difficult (or impossible) to prove in Medium, putting it in Hard won't make it any easier. IP Logged THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you. cool_joh Newbie     Gender: Posts: 50 Re: pq-p-q prime?   « Reply #2 on: Jul 20th, 2008, 1:42am » Wow, it was a long time ago. I didn't remember posting it. Sorry, you can lock this, and I'll revive the old topic to continue the discussion. IP Logged MATH PRO Pages: 1  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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