PRP · Probable prime
Enter a value, an expression, or a term with a variable like 10^n+1 to list a range.
Switch to Database id to look a number up by its stored id.
Reading never stores anything; use Create to add a number to the database.
See the expression syntax & functions reference.
Is factor of
Primality
This is a probable prime: it passes probabilistic tests but is not yet proven.
Build an ECPP certificate (for example with Primo) and upload it - it is stored and verified locally, then the number is promoted to proven prime.
Primo input filedownload .in
From the command linefdb · curl
fdb
fdb number '28277459784841627447344355467717687815666352229552851139177041089197110215297627997624455511407642575625117979327051175158144991892949769980099062205809818374670326336628138139491154740430854269204983761768340154798182966320288210908194463031845952130365175049783385728160103718578149687467538139841874415424657060614713184974945215324444878625175069557531549017072205555354465719952389755235743698311917570215854131635708180333324184477364317288897823711982234055453238232336048393192182198328543492118330146201112697555875204806536083391856334315983013924361868859092343763404498521278677014726288873453753193165835843153661824841142885306013770134707862563337958463892260036649574307506289408783848393432036755243049114409779826076908530795859247704632990382380392343201893630148381727110884024903978769871569604645285611778239555242502893585756688734917744666712228866803220634577465526158837354353966571326610681466805675093489099631562444748404849535301993506796325511889829681664526803576870341890863906089572515720684919057485891918279484148878282669082932795429640873088232183319845596426334920986119442685876209484693289643164118257835499397918585463991085769400720275204766258662170410127739669737495160135190433606686958887664501162454558140634068576026329892021133566582084955096580779740555226572039802679996496443441354674288228327113614574754361045618098626302200160441201726562851356815861343113830455763040696812533592960770124615954524950834928291244162977448463058169407470383669548668272737187437900716442317768465039988155061809283753' --detail 2
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"get_number","params":{"target":{"expr":"28277459784841627447344355467717687815666352229552851139177041089197110215297627997624455511407642575625117979327051175158144991892949769980099062205809818374670326336628138139491154740430854269204983761768340154798182966320288210908194463031845952130365175049783385728160103718578149687467538139841874415424657060614713184974945215324444878625175069557531549017072205555354465719952389755235743698311917570215854131635708180333324184477364317288897823711982234055453238232336048393192182198328543492118330146201112697555875204806536083391856334315983013924361868859092343763404498521278677014726288873453753193165835843153661824841142885306013770134707862563337958463892260036649574307506289408783848393432036755243049114409779826076908530795859247704632990382380392343201893630148381727110884024903978769871569604645285611778239555242502893585756688734917744666712228866803220634577465526158837354353966571326610681466805675093489099631562444748404849535301993506796325511889829681664526803576870341890863906089572515720684919057485891918279484148878282669082932795429640873088232183319845596426334920986119442685876209484693289643164118257835499397918585463991085769400720275204766258662170410127739669737495160135190433606686958887664501162454558140634068576026329892021133566582084955096580779740555226572039802679996496443441354674288228327113614574754361045618098626302200160441201726562851356815861343113830455763040696812533592960770124615954524950834928291244162977448463058169407470383669548668272737187437900716442317768465039988155061809283753"},"decimal":false,"detail":2}}'