Definition:Sophie Germain Prime/Largest Known

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Largest Known Sophie Germain Primes

The largest known Sophie Germain primes (as of May 2017) are as follows:

Sophie Germain prime Number of digits Date discovered Discovered by
$137211941292195 \times 2^{171960} - 1$ $51780$ 3rd May 2006 Zoltán Járai, Gabor Farkas, Timea Csajbok, János Kasza and Antal Járai
$48047305725 \times 2^{172403} - 1$ $51910$ 25th January 2007 David Underbakke
$607095 \times 2^{176311} - 1$ $53081$ 18th September 2009 Tom Wu
$99064503957 \times 2^{200008} - 1$ $60220$ April 2016 S. Urushihata
$620366307356565 \times 2^{253824} - 1$ $76424$ 2nd November 2009 Zoltán Járai, Gabor Farkas, Timea Csajbok, János Kasza and Antal Járai
$648621027630345 \times 2^{253824} - 1$ $76424$ 2nd November 2009 Zoltán Járai, Gabor Farkas, Timea Csajbok, János Kasza and Antal Járai
$183027 \times 2^{265440} - 1$ $79911$ 22nd March 2010 Tom Wu
$18543637900515 \times 2^{666667} - 1$ $200701$ April 2012 Philipp Bliedung
$2618163402417 \times 2^{1290000} - 1$ $388342$ February 2016 James Scott Brown