> 93379723 / 29723689 is pretty good. Can anyone get better? :) 3141592653979/1000000000000 ;^) On 5/29/15, Ryan O'Connor wrote: > 93379723 / 29723689 is pretty good. Can anyone get better? :) > > Ryan > > On 29 May 2015 at 16:35, RussellMc wrote: >> On 29 May 2015 at 15:05, Harold Hallikainen >> wrote: >> >>> That formula for pi is in the manual that came with my HP-35 calculator >>> in >>> 1972. >>> >> >> My brain told me that it came via HP (which I thought about mentioning) >> but I did not remember beyond that. A friend bought an HP35 in 1973 - so >> that may well have been the source. >> >> I imagine that formulae that come with modern calculators will not last >> anywhere near as long as those which were provided 40+ years ago. >> >> The traditional 22/7 returns >> >> 3.142 857 142 857 =3D 22/7 >> 3.141 592 653 979 =3D Pi >> 3.141 592 920 353 =3D 355/113 >> >> 22/7 Pi x 1.004024... >> >> ___________________________________ >> >> I made a spreadsheet with 65,530 calculation lines. >> Very simplistically it starts with 22/7 and advances numerator if a/b< P= i >> and denominator if > Pi. Yes, I too can think of better ways to do this. >> It found 355/113 (as you'd hope) and all multiples. >> Interestingly, very little else got very close. >> >> 1 / (Pi - x) >> >> 2.68E-7 355/113 >> 8.27E-7 49722/15827 >> >> Other peaks are down around 20% as good but improving linearly with size >> of numbers. Something better than 355/113 looks due to pop out around >> 248610 / 79135 (which is a multiple of 355/113) >> >> ie 355/113 is astoundingly good and a very lucky find and fact OR an >> artefact of something that is (to me) inobvious. >> >> >>> We haven't yet dealt with >>> >> >> >> >>> >>> > Watts ~=3D Torque in kg.m x RPM >>> >> :-) >> >> >> >> >>> Russell >>> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 Tobias Gogolin Tel. D1 (49) 0151 5187 5210 Tel. D2 (49) 0152 0839 5060 skype: moontogo You develop Sustainable Ranch Technology at http://tech.groups.yahoo.com/group/SURA-TECH an Open Source Electric Motor/Alternator at http://groups.yahoo.com/group/Performance_Axial_Flux and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .