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 '263945437272045618472398408174294223164056127062939991130576972831522088986253291791295393369238996268993313472125268861470756438639439005113727521845486245445405777057784425210440946108052095380855293240714078864935080633026476656503792724436840249237510018219752685379659989589347898981405992543654185365249426362644789700406932059387861407955761781580702068160530536255079590767531393066100005147045453137665011937229944228872600150456105539327308310650828236096605204017938508132997420052334792139140841712504654934655775258496776456002494897570599369588766640213816009848393678283608654034722868149031442902726822812609109052335959370973875393503240685910374830745278385492636759227716423259765591771659947593708607676766678325142522349508127437293755451016426278935031623468954210292638946112101139968751200414590724525185282761745702213377213776040090033101230423824830214066248421136892971595311510469474373797570565418957990233094010306217697938367214969469493936708444022174305072381191268423315048630006213572255805313066810611397633973508528565300088472882075409243751835672046292710117135769673475587878895534426979228169488094189193861714229963876273535862046338720115443965799443160341497851052996513986620831887388915939969036569013542226307704638979601324491561025060761782996211295304350082456847' --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":"263945437272045618472398408174294223164056127062939991130576972831522088986253291791295393369238996268993313472125268861470756438639439005113727521845486245445405777057784425210440946108052095380855293240714078864935080633026476656503792724436840249237510018219752685379659989589347898981405992543654185365249426362644789700406932059387861407955761781580702068160530536255079590767531393066100005147045453137665011937229944228872600150456105539327308310650828236096605204017938508132997420052334792139140841712504654934655775258496776456002494897570599369588766640213816009848393678283608654034722868149031442902726822812609109052335959370973875393503240685910374830745278385492636759227716423259765591771659947593708607676766678325142522349508127437293755451016426278935031623468954210292638946112101139968751200414590724525185282761745702213377213776040090033101230423824830214066248421136892971595311510469474373797570565418957990233094010306217697938367214969469493936708444022174305072381191268423315048630006213572255805313066810611397633973508528565300088472882075409243751835672046292710117135769673475587878895534426979228169488094189193861714229963876273535862046338720115443965799443160341497851052996513986620831887388915939969036569013542226307704638979601324491561025060761782996211295304350082456847"},"decimal":false,"detail":2}}'