48 122 471 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷³

TF target 2⁷²

P-1

B1 =	555000
B2 =	13042500

Status	Date	User	Residue	Shift	Software
Bad	2009-12-26	-anonymous-	A6958F90A8584EE7	28405074	Windows,Prime95,v24 final,(aka Wc1)
Verified	2016-02-02	Greg	2F14E6A0BDF74AF7	18401935	CUDALucas v2.05 Beta
Verified	2016-09-01	AirSquirrels	2F14E6A0BDF74AF7	31250057	CUDALucas v2.05.1
Verified	2022-11-26	Kriesel	2F14E6A0BDF74AF7	11080053	Windows 64-bit,Prime95,v30.8,build 14

History

Date	User	Type	Result
2022-11-26	Kriesel	C-LL	2F14E6A0BDF74AF7
2017-12-14	Mark Rose	NF	no factor TF: 72-73
2016-09-01	AirSquirrels	C-LL	2F14E6A0BDF74AF7
2016-02-02	Greg	C-LL	2F14E6A0BDF74AF7
2015-09-09	LaurV	NF	no factor TF: 71-72
2015-09-09	LaurV	NF	no factor TF: 70-71
2015-08-30	Gordon Spence	NF	no factor TF: 69-70
2009-12-26	Richard_Prairie	C-LL	A6958F90A8584EE7
2009-10-31	Richard_Prairie	NF-PM1	B1=555000, B2=13042500
2008-05-10	JC_Herles	NF	no factor TF: 1-69
2003-12-13	Thomas Mullen	NF	no factor TF: 1-64
2003-12-13	Thomas Mullen	NF	no factor TF: 1-62
2003-12-13	Thomas Mullen	NF	no factor TF: 1-63
2003-10-14	Thomas Mullen	NF	no factor TF: 1-62
2003-09-21	Thomas Mullen	NF	no factor TF: 1-61
2003-06-09	Thomas Mullen	NF	no factor TF: 1-60
2003-06-06	Thomas Mullen	NF	no factor TF: 1-59