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 '20511893359283603130577911590295589154492210207193601372631756333451553366681419609513109274368776872840947203067876166476902442279216208450992921140131014566909664508722259122373399971841197879694341862270766126721995393910269541229467941105697163266083519889767327230660163005310130369187784312273749303968012204237865610183490860812954809585025465804067340003144141252042145707276722411790386887595609415752244844560813685716015766770023464443345354113409183278867015308948539476260254299368813843877700592017807674591521107488970038210171147738066542442064936340007994488634581846975624615193705670519643746614929571094788939252429126623376409107385330132413985954473430894874512802933570011697198927287488514646420827901505612730406737185304555240142383738207382912423177178417312657423055987655243181062205302753872711629463704059321820097274986638474468411061801421779168309254970179970648746563036368961309680075526446433056116018621266756134651366766703270848353861380550313374531799062646549535834653883315054017141092928697764425169375263382551175656413180608829381469211759227870201933722121334205667799668842395456676416472969220509668086583375552111810414211344593444144142460104642084111492184875560687895800335202297630039386178538805539118455106378730282850069896417414940515740416562516903402674688204438868233397576798035865899724801178026191609637311902319451477063135154292107504801647702799563881229790871939972413864709536039656804931920230220106671795115538334684350555714479705475002789274550992462959095060246663656723779065465383719475953335191158813082475933646889490759608147247676794529247666794323015022096344815841259984695172179766832661158309424040447962140571627091665028197570459219594241911228562174579310781561442305762491507819316346997' --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":"20511893359283603130577911590295589154492210207193601372631756333451553366681419609513109274368776872840947203067876166476902442279216208450992921140131014566909664508722259122373399971841197879694341862270766126721995393910269541229467941105697163266083519889767327230660163005310130369187784312273749303968012204237865610183490860812954809585025465804067340003144141252042145707276722411790386887595609415752244844560813685716015766770023464443345354113409183278867015308948539476260254299368813843877700592017807674591521107488970038210171147738066542442064936340007994488634581846975624615193705670519643746614929571094788939252429126623376409107385330132413985954473430894874512802933570011697198927287488514646420827901505612730406737185304555240142383738207382912423177178417312657423055987655243181062205302753872711629463704059321820097274986638474468411061801421779168309254970179970648746563036368961309680075526446433056116018621266756134651366766703270848353861380550313374531799062646549535834653883315054017141092928697764425169375263382551175656413180608829381469211759227870201933722121334205667799668842395456676416472969220509668086583375552111810414211344593444144142460104642084111492184875560687895800335202297630039386178538805539118455106378730282850069896417414940515740416562516903402674688204438868233397576798035865899724801178026191609637311902319451477063135154292107504801647702799563881229790871939972413864709536039656804931920230220106671795115538334684350555714479705475002789274550992462959095060246663656723779065465383719475953335191158813082475933646889490759608147247676794529247666794323015022096344815841259984695172179766832661158309424040447962140571627091665028197570459219594241911228562174579310781561442305762491507819316346997"},"decimal":false,"detail":2}}'