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wu :: forums    riddles    medium (Moderators: SMQ, william wu, towr, Grimbal, Icarus, Eigenray, ThudnBlunder)    primes puzzle « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: primes puzzle  (Read 474 times) amichail Senior Riddler     Posts: 450 primes puzzle   « on: Dec 1st, 2006, 7:45pm » Quote Modify Consider the following set:   S={2,3,5,7,11,19,41,61,89,409,449,499,881,991,6469,6949,9001,9049, 9649,9949,60649,666649,946669,60000049,66000049,66600049}   Prove that any prime is already a member of S or it can be transformed to at least one of these 26 primes in S, by the simple and only procedure of eliminating one or several digits. IP Logged DropZap - a new kind of block elimination game 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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