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wu :: forums    riddles    cs (Moderators: william wu, towr, Grimbal, Icarus, ThudnBlunder, Eigenray, SMQ)    k digit of pow(n,n) « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: k digit of pow(n,n)  (Read 791 times) serenity Newbie     Posts: 25 k digit of pow(n,n)   « on: Apr 21st, 2010, 10:33pm » Quote Modify Problem is to find first k digit and last k digit of number pow(n,n)   sorry if its present, i tried searching it but didnt got ny result IP Logged newb Newbie     Posts: 38 Re: k digit of pow(n,n)   « Reply #1 on: Apr 21st, 2010, 11:59pm » Quote Modify How large is k? IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: k digit of pow(n,n)   « Reply #2 on: Apr 22nd, 2010, 1:11am » Quote Modify You can find the last digits using modular arithmetic. And the front ones with sufficiently precise logarithms, I think. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB newb Newbie     Posts: 38 Re: k digit of pow(n,n)   « Reply #3 on: Apr 22nd, 2010, 3:02am » Quote Modify here is a similar thread.   1.http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_cs; action=display;num=1236098729;start=9#9   2.http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_cs; action=display;num=1265901209;start=8#8.   @Towr   Can you suggest a method for calculating logarithm precise enough, for language like C/C++. IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: k digit of pow(n,n)   « Reply #4 on: Apr 22nd, 2010, 3:30am » Quote Modify I'd use some high precision library for that; they should include a logarithm function.   I wouldn't even be able to tell you how to calculate a logarithm without sufficient precision without looking it up IP Logged Wikipedia, Google, Mathworld, Integer sequence DB 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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