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Old 2010-04-13, 14:16   #1
Merfighters
 
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Mar 2010
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Default Weighted Fermat factors Top 20

Chris Cardwell's page only records factors that have at least 1000 digits, so I made this one.

The definition of 'weight' is on this page.
http://primes.utm.edu/top20/page.php?id=8


Weighted Fermat Factors Top 20

1. 17353230210429594579133099699123162989482444520899 · 215 + 1 (Divides F12, weight 129.4057167, 27 Mar 2010)
2. 1784180997819127957596374417642156545110881094717 · 216 + 1 (Divides F14, weight 127.089642, 03 Feb 2010)
3. 3640431067210880961102244011816628378312190597 · 211 + 1 (Divides F9, weight 120.6306686, 15 Jun 1990)
4. 1137640572563481089664199400165229051 · 212 + 1 (Divides F10, weight 98.07309278, 20 Oct 1995)
5. 8962167624028624126082526703 · 222 + 1 (Divides F19, weight 78.97070728, 18 Jul 2009)
6. 3853959202444067657533632211 · 224 + 1 (Divides F22, weight 78.14871529, 26 Mar 2010)
7. 1287603889690528658928101555 · 217 + 1 (Divides F15, weight 76.8033248, 03 Jul 1997)
8. 609485665932753836099 · 219 + 1 (Divides F13, weight 61.60694282, 16 Jun 1995)
9. 180227048850079840107 · 220 + 1 (Divides F16, weight 60.36050868, Dec 1996)
10. 434673084282938711 · 213 + 1 (Divides F11, weight 53.68893623, 13 May 1988)
11. 9688698137266697 · 223 + 1 (Divides F18, weight 50.08420661, 16 Apr 1999)
12. 10253207784531279 · 214 + 1 (Divides F11, weight 49.73498805, 17 May 1988)
13. 659 · 2617815 + 1 (Divides F617813, weight 47.95550537, 31 Mar 2009)
14. 519 · 2567235 + 1 (Divides F567233, weight 47.45383317, 06 Mar 2009)
15. 1207 · 2410108 + 1 (Divides F410105, weight 47.29928986, 22 Nov 2005)
16. 7 · 22167800 + 1 (Divides F2167797, weight 47.26888554, 21 Feb 2003)
17. 651 · 2476632 + 1 (Divides F476624, weight 47.1447619, 28 Dec 2008)
18. 3 · 22478785 + 1 (Divides F2478782, weight 46.83313407, 10 Oct 2003)
19. 3 · 22145353 + 1 (Divides F2145351, weight 46.3896277, 17 Apr 2007)
20. 151 · 2585044 + 1 (Divides F585042, weight 46.31433525, 17 Mar 2007)
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