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Small Mersenne Prime Factors
Prime numbers of the form Mp= 2p − 1 are called Mersenne primes. For Mp to be prime, p must also be prime.
Any factor q of a Mersenne number 2p − 1 must be of the form 2kp + 1, where integer k ≥ 0. Furthermore, q must be 1 or 7 mod 8.
Exponent Prime Factor Digits Year
198507833476418799310 ~1998
1985078993970157999 ~1996
198508931516123220710 ~1999
1985094833970189679 ~1996
198521077119112646310 ~1997
198525241119115144710 ~1997
1985264033970528079 ~1996
1985366993970733999 ~1996
1985369513970739039 ~1996
198541579198541579110 ~1998
1985438993970877999 ~1996
198556207198556207110 ~1998
1985597993971195999 ~1996
1985606993971213999 ~1996
1985665913971331839 ~1996
198566941119140164710 ~1997
198570479992852395110 ~1999
198581113119148667910 ~1997
1985914433971828879 ~1996
1985951513971903039 ~1996
198596351158877080910 ~1997
1986036593972073199 ~1996
1986082793972165599 ~1996
1986125393972250799 ~1996
1986141593972283199 ~1996
Exponent Prime Factor Digits Year
198617557119170534310 ~1997
198623317119173990310 ~1997
198627893119176735910 ~1997
1986309233972618479 ~1996
1986356633972713279 ~1996
198636521119181912710 ~1997
1986382433972764879 ~1996
1986391793972783599 ~1996
1986488393972976799 ~1996
1986505793973011599 ~1996
198651961119191176710 ~1997
1986529313973058639 ~1996
1986568313973136639 ~1996
1986590393973180799 ~1996
198661471357590647910 ~1998
1986619433973238879 ~1996
198665393119199235910 ~1997
1986662393973324799 ~1996
198666929278133700710 ~1998
198671089794684356110 ~1999
1986735113973470239 ~1996
1986816113973632239 ~1996
198683231158946584910 ~1997
1986862313973724639 ~1996
198686239953693947310 ~1999
Exponent Prime Factor Digits Year
1986940913973881839 ~1996
198694813596084439110 ~1999
1986973193973946399 ~1996
198699041119219424710 ~1997
198700393437140864710 ~1998
1987058633974117279 ~1996
198719561119231736710 ~1997
1987198193974396399 ~1996
198723479357702262310 ~1998
198731801119239080710 ~1997
1987330193974660399 ~1996
198734293119240575910 ~1997
198735367198735367110 ~1998
198740173437228380710 ~1998
198744901119246940710 ~1997
198764021159011216910 ~1997
1987659233975318479 ~1996
198772781159018224910 ~1997
1987738193975476399 ~1996
198776657119265994310 ~1997
1987780433975560879 ~1996
198778873119267323910 ~1997
198780941119268564710 ~1997
1987908113975816239 ~1996
198792257477101416910 ~1998
Exponent Prime Factor Digits Year
1987949033975898079 ~1996
1987949513975899039 ~1996
1988023913976047839 ~1996
1988080913976161839 ~1996
198820837596462511110 ~1999
198821101119292660710 ~1997
1988246633976493279 ~1996
1988289113976578239 ~1996
1988328113976656239 ~1996
1988332913976665839 ~1996
198839521119303712710 ~1997
1988403713976807439 ~1996
1988407313976814639 ~1996
1988524433977048879 ~1996
1988622113977244239 ~1996
1988624513977249039 ~1996
1988635375249997376911 ~2001
1988683091869362104711 ~2000
1988848313977696639 ~1996
1988864231909309660911 ~2000
1988890793977781599 ~1996
198895003198895003110 ~1998
1989023513978047039 ~1996
1989048833978097679 ~1996
1989184313978368639 ~1996
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25-05-04