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These pages describe some of my current interests.  They include the Sydney PC User Group, the PIC Club (part of the PCUG interested in PICs or microprocessors), web design, factorising of large integers and digital photography.

Pic of the week
Last update: Wed Feb 10, 2010 — Feedback to Bob Backstrom

• Recent Factors NEW

Feb 10, 2010
 
46 • 10191 + 17  [511903]c187p57: 2607622972­6981354412­9807543823­8827987297­9966516799­7971159 •
p131: 3295279544­6039739761­2110549023­5453694739­2420415529­1170746298­4141824040­2306663274­8503874847­1392794539­7575803753­8330744952­6523769944­7
Feb 8, 2010
 
68 • 10191 - 41  [751901]c188p42: 3705415049­3536451228­2877622144­5952390038­27 •
p59: 5236701327­1029342530­1731468015­2939858727­0217068986­714996259 •
p87: 5713631799­0008352912­0043343340­5755320474­2297844584­6563128565­5174614769­4972394021­6358043
 
26 • 10194 - 17  [281937]c191p40: 7424577444­0814651996­4487839022­1956376139 •
p53: 9694285670­3978898224­6099084369­5320276740­6259931799­891 •
p98: 2171085077­6123173933­7955223363­7657359209­6102085576­3501415695­9148580801­6975406800­5650732056­63702449
Feb 6, 2010
 
56 • 10194 + 61  [621939]c192p60: 1677232837­5744074691­6974688109­4101067748­8550278999­0615669323 •
p133: 5897955826­2577729046­8184435302­8642343287­2034049277­6567862933­0135315262­3123776499­5794199455­5802947580­7293807548­5296004287­2611185829­187
Feb 5, 2010
 
6 • 10193 - 1  [59193]c187p88: 1516632346­1515002779­5453606037­8045125068­4223460419­3099928749­8979457151­0186598901­69586137 •
p100: 4381242358­1814424629­8269754463­1107043610­4266899902­8893877951­1626077241­2552778319­3669830412­7384847461
Feb 3, 2010
 
3 • 10193 - 7  [291923]c187p37: 7785800216­7725763162­9150371288­2966307 •
p150: 2578028783­1985851046­7556950027­2224065204­6663444825­4185169836­9691589454­2071072976­2366838181­6163098411­9333658955­1434596424­7886751559­7744013948­8578094679
 
2495 + 3c148p32: 4600317944­9037741824­6459404665­67 •
p37: 7159642861­2374819938­2853567309­6843303 •
p80: 1070953582­8090997953­1067759885­2854203602­3911308026­9701879142­2570526658­8623287599
Feb 2, 2010
 
25 • 10193 + 11  [271929]c188p59: 6783596503­1192149607­6280465942­4170431408­4353735131­105939663 •
p59: 8153935755­5222729527­2744067262­4831982636­7884605698­825415503 •
p71: 1030732547­9407677842­8355518738­8722440233­5300661251­1895708029­3868204156­9
Feb 1, 2010
 
3 • 2641 + 1c187p80: 4336028073­2099940925­0939326369­0659488259­0956698551­9497703718­5193143115­7180346353 •
p108: 1096632572­3688389981­8786141245­9838874022­9381397526­9400296284­7746642440­0654509750­4996527568­6764552283­95741987
 
7 • 2626 + 1c183p80: 1314875079­5790772237­6362901825­6789757846­3761679954­8209535142­6684801345­4732647281 •
p103: 8590585983­1935863803­5788447195­6042040302­9683377083­3239985946­0521857982­6274901058­1702054169­5087058387­981

Some interesting numbers to factorise have repeated digits.  For example, 2 • 10157 - 1 (or 1 followed by 157 nines written as 19157).  See Makoto Kamada's website for a large collection of these numbers.  >>

• Alternate Web-page Style

Here is a mirror of this web-site, but in a parallel universe using black text on a pale background. >>

• Blogs

See the Blogs: bobb777 and sydneypcug.  >>

• Windows 7

See some screen-shots of the new Windows 7 Release Candidate.  >>

• Download Page

The latest addition is an Unscramble program to solve Jumble™ puzzles.  >>

• Sydney PC User Group

The Sydney PC User Group is an independent club of users discussing all aspects of using personal computers and helping each other solve computer problems.  It also has several Special Interest Groups or SIGs.  >>

• The PIC Club

Microprocessors such as Programmable Integrated Circuits made by the Microchip company are easily programmed to perform various interesting sensing and control functions.  The PIC Club grew out of the Programming SIG of the Sydney PCUG.  >>

• Web Design

This web-page has been written with NetObjects Fusion, the program used by the Web Design SIG.  See the SIG Reports for recent meeting information.

See my experiments with Joomla! which is an open source online web-page editing package, available on most web hosting sites.  >>

• The DOS ftp Command

Use the inbuilt DOS ftp command to upload files quickly from a batch file.  If uploading different files each time, however, use a Windows FTP program like the free Core-FTP program instead.

Read the details in this short tutorial.  >>

• Soft Hyphens

See what soft hyphens are all about.  Enable Javascript and check out your browser by loading this test page.  We check the Windows version of Apple's Safari browser.  >>

• Unicodes

Unicodes may be necessary in HTML when named symbols are not available (for Cyrillic characters Я and и for example).  >>

• HTML and XHTML Validation

Check that you have valid HTML or XHTML code online using the World Wide Web Consortium (W3C) official site or offline using the free CSE HTML Validator Lite v9.02 program.  >>

• Factors of Large Integers

A 102-digit personal record prime factor has been found on February 4th, 2009.  It divides the 205-digit number (37 × 10204 + 17) / 9 or 412033.

Work is progressing on factorising numbers of the form k • 2n ± 1 with k (odd) from 3 to 15 and n ≤ 1000.  The results are recorded by Mikael Klasson.  >>

• Factoring Program, Msieve

Msieve, written by Jason Papadopoulos is described.  It contains fast code to solve large sets of linear equations.  See the new Perl script to automate Msieve post-processing after a GGNFS run.  >>

• Digital Photos

See our friend Bill and a "floating ship" which appears to hang suspended above the horizon...  >>

• Sesame Electronics Pty Ltd

Quoting from the web-site:

We make Printed Circuit Boards.

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