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 Showing results 1 to 25 of 59 Search took 0.01 seconds. Search: Posts Made By: bbb120
 Forum: FermatSearch 2020-11-27, 02:33 Replies: 65 Views: 7,937 Posted By bbb120 http://www.numberworld.org/y-cruncher/internals/bi... http://www.numberworld.org/y-cruncher/internals/binary-splitting-library.html#pi_chudnovsky maybe this is answer
 Forum: y-cruncher 2020-11-18, 05:33 Replies: 49 Views: 35,340 Posted By bbb120 chinese 10,000=1万=10 thousand ... chinese 10,000=1万=10 thousand 100,000,000=1亿=100 million 123456789123456789=123_456_789_123_456_789(English) 123456789123456789=12_3456_7891_2345_6789(chinese) English grouping digits three by...
 Forum: y-cruncher 2020-11-18, 01:05 Replies: 49 Views: 35,340 Posted By bbb120 F33 only has no more than 2700 billion digits ... F33 only has no more than 2700 billion digits it should be "F33 only has no more than 2700 million digits" I make a mistake ! floor(2^33*log(2)+1)=floor(2585827973.98) ...
 Forum: y-cruncher 2020-11-17, 06:18 Replies: 49 Views: 35,340 Posted By bbb120 What are the advantages of y-cruncher ? Why... What are the advantages of y-cruncher ? Why can it calculate so many digits? https://www.mersenneforum.org/showpost.php?p=562790&postcount=14 why we can calculate 50 trillion digits of Pi ,but...
 2020-11-17, 06:13 Replies: 8 Views: 4,832 Posted By bbb120 How can I run PRP test? which software can give a PRP test ? how long does it cost ?
 Forum: FermatSearch 2020-11-12, 01:55 Replies: 65 Views: 7,937 Posted By bbb120 you don't know Google and Wikipedia and Twitter... you don't know Google and Wikipedia and Twitter and Facebook and YouTube can not be used in some country
 Forum: FermatSearch 2020-11-12, 01:17 Replies: 65 Views: 7,937 Posted By bbb120 http://numbers.computation.free.fr/Constants/Algor... http://numbers.computation.free.fr/Constants/Algorithms/splitting.html In mathematics, binary splitting is a technique for speeding up numerical evaluation of many types of series with rational...
 Forum: FermatSearch 2020-11-11, 02:34 Replies: 65 Views: 7,937 Posted By bbb120 what does binary splitting mean? can you give... what does binary splitting mean? can you give more information about binary splitting ?
 Forum: FermatSearch 2020-11-11, 02:33 Replies: 65 Views: 7,937 Posted By bbb120 1/(2^33*log(2))=1.679518074832116*10^-10 not... 1/(2^33*log(2))=1.679518074832116*10^-10 not 1/(2^33*log(2))=3.86723328252e-10(wrong caused by sogou pinyin)
 Forum: FermatSearch 2020-11-11, 00:45 Replies: 65 Views: 7,937 Posted By bbb120 according to prime number theorem , the... according to prime number theorem , the probability of F33 is a prime only has 1/(2^33*log(2))=3.86723328252e-10, so it must be a composite number !
 Forum: FermatSearch 2020-11-11, 00:37 Replies: 65 Views: 7,937 Posted By bbb120 F33=2^(2^33)+1=2^8589934592+1 ... F33=2^(2^33)+1=2^8589934592+1 (F33-1)/2=2^4294967296 3^((F33-1)/2)=-1(mod F33) <=> F33 is a prime number it needs 4294967296 iterations 50 Trillion Digits of Pi，50*10^12， 15digits per...
 Forum: FermatSearch 2020-11-10, 06:11 Replies: 65 Views: 7,937 Posted By bbb120 50 Trillion Digits of Pi ... 50 Trillion Digits of Pi https://www.mersenneforum.org/showthread.php?t=25155 why we can calculate 50 trillion digits of Pi ,but cannot test a PRP test on F33， F33 only has no more than 2700...
 Forum: FermatSearch 2020-11-10, 00:20 Replies: 32 Views: 2,854 Posted By bbb120 do you find any factor of fermat number ? do you find any factor of fermat number ?
 Forum: FermatSearch 2020-11-08, 00:27 Replies: 32 Views: 2,854 Posted By bbb120 why download software from www.fermatsearch.org? ... why download software from www.fermatsearch.org? my mathematica code can get factor correctly, and it is efficiently ,maybe not the most efficiently.
 Forum: FermatSearch 2020-11-07, 00:51 Replies: 32 Views: 2,854 Posted By bbb120 I only know how to find factor of fermat number... I only know how to find factor of fermat number by writing mathematica code my code to find F36 factor Clear["Global`*"]; n=36;(*the nth fermat number*) Do[p=k*2^(n+2)+1;(*probable factor*) ...
 Forum: FermatSearch 2020-11-06, 05:24 Replies: 32 Views: 2,854 Posted By bbb120 How to sieve ? I only know p=k*2^(n+2)+1 must be... How to sieve ? I only know p=k*2^(n+2)+1 must be a prime, so we can use primality to sieve any potential p=k*2^(n+2)+1, is there any more efficient method to sieve potential p=k*2^(n+2)+1?
 Forum: FermatSearch 2020-11-06, 04:45 Replies: 32 Views: 2,854 Posted By bbb120 I do not want to find any factor of fermat number... I do not want to find any factor of fermat number ,because it is very difficult to find one ,I only want to know the algorithm behind it
 Forum: FermatSearch 2020-11-06, 02:50 Replies: 32 Views: 2,854 Posted By bbb120 reading codes whrite by others is not an easy... reading codes whrite by others is not an easy thing, so I only take interest in algorithm in it
 Forum: FermatSearch 2020-11-06, 00:28 Replies: 32 Views: 2,854 Posted By bbb120 Fn=2^(2^n)+1 has factors in k*2^(n+2)+1 this... Fn=2^(2^n)+1 has factors in k*2^(n+2)+1 this form, so we can test a primality on p=k*2^(n+2)+1 before we calculate Fn Mod p, do you have any algorithm which can be more faster to get factor?
 Forum: FermatSearch 2020-11-06, 00:12 Replies: 32 Views: 2,854 Posted By bbb120 you know too much than me ,I only can write... you know too much than me ,I only can write simple program.
 Forum: GMP-ECM 2020-11-06, 00:10 Replies: 28 Views: 4,115 Posted By bbb120 not strange， I take Great curiosity on... not strange， I take Great curiosity on primality and integer factorization.
 Forum: FermatSearch 2020-11-05, 06:23 Replies: 32 Views: 2,854 Posted By bbb120 so it is impossible for me to get f118 factor... so it is impossible for me to get f118 factor without GPU at present ? I have no GPU ,I only have CPU
 Forum: FermatSearch 2020-11-05, 05:45 Replies: 32 Views: 2,854 Posted By bbb120 how to get F118 factor 1527888802614951*2^120+1? 1527888802614951*2^120 + 1 1527888802614951 has 16 digits , if we calculate and try 10^5 per second , it will cost 10^15/(365*24*60*60)/10^5=317.1years for us to find this factor , Peter...
 Forum: GMP-ECM 2020-11-05, 05:13 Replies: 28 Views: 4,115 Posted By bbb120 are you Ryan Propper？？？ are you Ryan Propper？？？
 Forum: GMP-ECM 2020-11-05, 01:26 Replies: 28 Views: 4,115 Posted By bbb120 I have one personal computer ,Windows 7 operating... I have one personal computer ,Windows 7 operating system ,but works slowly , so I want to know what kind of hardware helps Ryan Propper to get that 83digits factor
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