Method Mp # Discovered Discoverer p Mp digits used 1 2 1 c. 430 BC Ancient Greek 2 3 1 c. 430 BC mathematicians Ancient Greek 3 5 2 c. 300 BC mathematicians Ancient Greek 4 7 3 c. 300 BC mathematicians 5 13 8191 4 1456 Anonymous Trial 6 17 131071 6 1588 division Trial 7 19 524287 6 1588 Pietro Cataldi division Enhanced 8 31 10 1772 trial division 1883 9 61 2305843009213693951 19 November **10 89 27 1911 June 618970019…449562111 1914 June Lucas 107 33 162259276…010288127 1 sequences 11 1876 Lucas 12 127 39 170141183…884105727 January 10 sequences 1952 13 521 157 / 686479766…115057151 January 30 1952 Raphael M. LLT / 14 607 183 531137992…031728127 January 30 Robinson SWAC 1952 June Raphael M. LLT / 15 1,279 386 104079321…168729087 25 Robinson SWAC 1952 Raphael M. LLT / 16 2,203 664 147597991…697771007 October 7 Robinson SWAC 1952 Raphael M. LLT / 17 2,281 687 446087557…132836351 October 9 Robinson SWAC 18 3,217 969 1957 LLT / 259117086…909315071
# p Mp Mp digits Discovered Discoverer Method used 1 2 1 c. 430 BC 2 3 1 c. 430 BC Ancient Greek mathematicians 3 5 2 c. 300 BC Ancient Greek mathematicians 4 7 3 c. 300 BC Ancient Greek mathematicians 5 13 8191 4 1456 Anonymous 6 17 131071 6 1588 Trial division 7 19 524287 6 1588 Pietro Cataldi Trial division 8 31 10 1772 Enhanced trial division 9 61 2305843009213693951 19 1883 November **10 89 618970019…449562111 27 1911 June 11 107 162259276…010288127 33 1914 June 1 Lucas sequences 12 127 170141183…884105727 39 1876 January 10 Lucas sequences 13 521 686479766…115057151 157 1952 January 30 / 14 607 531137992…031728127 183 1952 January 30 Raphael M. Robinson LLT / SWAC 15 1,279 104079321…168729087 386 1952 June 25 Raphael M. Robinson LLT / SWAC 16 2,203 147597991…697771007 664 1952 October 7 Raphael M. Robinson LLT / SWAC 17 2,281 446087557…132836351 687 1952 October 9 Raphael M. Robinson LLT / SWAC 18 3,217 259117086…909315071 969 1957 LLT /
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