mersenneforum.org

mersenneforum.org (https://www.mersenneforum.org/index.php)
-   Factoring (https://www.mersenneforum.org/forumdisplay.php?f=19)
-   -   Weighted Fermat factors Top 20 (https://www.mersenneforum.org/showthread.php?t=13283)

Merfighters 2010-04-13 14:16

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.
[URL]http://primes.utm.edu/top20/page.php?id=8[/URL]


Weighted Fermat Factors Top 20

1. 17353230210429594579133099699123162989482444520899 · 2[sup]15[/sup] + 1 (Divides F[sub]12[/sub], weight 129.4057167, 27 Mar 2010)
2. 1784180997819127957596374417642156545110881094717 · 2[sup]16[/sup] + 1 (Divides F[sub]14[/sub], weight 127.089642, 03 Feb 2010)
3. 3640431067210880961102244011816628378312190597 · 2[sup]11[/sup] + 1 (Divides F[sub]9[/sub], weight 120.6306686, 15 Jun 1990)
4. 1137640572563481089664199400165229051 · 2[sup]12[/sup] + 1 (Divides F[sub]10[/sub], weight 98.07309278, 20 Oct 1995)
5. 8962167624028624126082526703 · 2[sup]22[/sup] + 1 (Divides F[sub]19[/sub], weight 78.97070728, 18 Jul 2009)
6. 3853959202444067657533632211 · 2[sup]24[/sup] + 1 (Divides F[sub]22[/sub], weight 78.14871529, 26 Mar 2010)
7. 1287603889690528658928101555 · 2[sup]17[/sup] + 1 (Divides F[sub]15[/sub], weight 76.8033248, 03 Jul 1997)
8. 609485665932753836099 · 2[sup]19[/sup] + 1 (Divides F[sub]13[/sub], weight 61.60694282, 16 Jun 1995)
9. 180227048850079840107 · 2[sup]20[/sup] + 1 (Divides F[sub]16[/sub], weight 60.36050868, Dec 1996)
10. 434673084282938711 · 2[sup]13[/sup] + 1 (Divides F[sub]11[/sub], weight 53.68893623, 13 May 1988)
11. 9688698137266697 · 2[sup]23[/sup] + 1 (Divides F[sub]18[/sub], weight 50.08420661, 16 Apr 1999)
12. 10253207784531279 · 2[sup]14[/sup] + 1 (Divides F[sub]11[/sub], weight 49.73498805, 17 May 1988)
13. 659 · 2[sup]617815[/sup] + 1 (Divides F[sub]617813[/sub], weight 47.95550537, 31 Mar 2009)
14. 519 · 2[sup]567235[/sup] + 1 (Divides F[sub]567233[/sub], weight 47.45383317, 06 Mar 2009)
15. 1207 · 2[sup]410108[/sup] + 1 (Divides F[sub]410105[/sub], weight 47.29928986, 22 Nov 2005)
16. 7 · 2[sup]2167800[/sup] + 1 (Divides F[sub]2167797[/sub], weight 47.26888554, 21 Feb 2003)
17. 651 · 2[sup]476632[/sup] + 1 (Divides F[sub]476624[/sub], weight 47.1447619, 28 Dec 2008)
18. 3 · 2[sup]2478785[/sup] + 1 (Divides F[sub]2478782[/sub], weight 46.83313407, 10 Oct 2003)
19. 3 · 2[sup]2145353[/sup] + 1 (Divides F[sub]2145351[/sub], weight 46.3896277, 17 Apr 2007)
20. 151 · 2[sup]585044[/sup] + 1 (Divides F[sub]585042[/sub], weight 46.31433525, 17 Mar 2007)


All times are UTC. The time now is 17:38.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.