Largest known prime number
History
Table:
Number

Decimal expansion
(only for numbers < 1050)

Digits

Year found

Discoverer
(see also Mersenne prime)

M7

127

3

c. 300 BC

Ancient Greek mathematicians [8]

M13

8,191

4

1456

Anonymous

M17

131,071

6

1588

Pietro Cataldi

M19

524,287

6

1588

Pietro Cataldi

2

32

+
1

641

{\displaystyle {\tfrac {2^{32}+1}{641}}}

6,700,417

7

1732

Leonhard Euler

M31

2,147,483,647

10

1772

Leonhard Euler

2

64

+
1

274177

{\displaystyle {\tfrac {2^{64}+1}{274177}}}

67,280,421,310,721

14

1855

Thomas Clausen

M127

170,141,183,460,469,231,731,687,303,715,884,105,727

39

1876

Édouard Lucas

2

148

+
1

17

{\displaystyle {\tfrac {2^{148}+1}{17}}}

20,988,936,657,440,586,486,151,264,256,610,222,593,863,921

44

1951

Aimé Ferrier with a mechanical calculator; the largest record not set by computer.

180×(M127)2+1

79

1951

Using Cambridge's EDSAC computer

M521

157

1952

M607

183

1952

M1279

386

1952

M2203

664

1952

M2281

687

1952

M3217

969

1957

M4423

1,332

1961

M9689

2,917

1963

M9941

2,993

1963

M11213

3,376

1963

M19937

6,002

1971

M21701

6,533

1978

M23209

6,987

1979

M44497

13,395

1979

M86243

25,962

1982

M132049

39,751

1983

M216091

65,050

1985

391581×2216193−1

65,087

1989

Largest non-Mersenne prime that was the largest known prime when it was discovered

M756839

227,832

1992

M859433

258,716

1994

M1257787

378,632

1996

M1398269

420,921

1996

GIMPS, Joel Armengaud

M2976221

895,932

1997

GIMPS, Gordon Spence

M3021377

909,526

1998

GIMPS, Roland Clarkson

M6972593

2,098,960

1999

GIMPS, Nayan Hajratwala

M13466917

4,053,946

2001

GIMPS, Michael Cameron

M20996011

6,320,430

2003

GIMPS, Michael Shafer

M24036583

7,235,733

2004

GIMPS, Josh Findley

M25964951

7,816,230

2005

GIMPS, Martin Nowak

M30402457

9,152,052

2005

GIMPS, University of Central Missouri professors Curtis Cooper and Steven Boone

M32582657

9,808,358

2006

GIMPS, Curtis Cooper and Steven Boone

M43112609

12,978,189

2008

GIMPS, Edson Smith

M57885161

17,425,170

2013

GIMPS, Curtis Cooper

M74207281

22,338,618

2016

GIMPS, Curtis Cooper

M77232917

23,249,425

2017

GIMPS, Jonathan Pace

M82589933

24,862,048

2018

GIMPS, Patrick Laroche

Consulting the tabular data covering 'Largest known prime number' (see 'History'), give a one-line statement limited to the highlighted cells and format it within the following JSON object {"answer": "YOUR ANSWER"}.