A158816 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A158816

Prime factors of 2^843 - 1

7, 80929, 1390916281, 2475486361, 48009215293052652841860443273079338843737271906291675944391068955229998769420319, 626322472637042112379617556574437460372478130091490111806135154280070248067062629972139895896953692975358576879266688023648639640273675162065398163911

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The 265 bit factor 48009215293052652841860443273079338843737271906291675944391068955229998769420319 was found in less than 30 seconds by Zhenxiang Zhang's method using a 2GHz Athlon. The entire factorization was completed in 47 seconds.

LINKS

Table of n, a(n) for n=1..6.

Zhenxiang Zhang, Using Lucas Sequences to Factor Large Integers Near Group Orders, 1999

CROSSREFS

Cf. A000040, A000225

Sequence in context: A194194 A110719 A068162 * A173839 A122000 A291906

Adjacent sequences: A158813 A158814 A158815 * A158817 A158818 A158819

KEYWORD

fini,full,nonn

AUTHOR

Reikku Kulon, Mar 27 2009

STATUS

approved