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 '19639989373482226804455913197798994149482600500417946910784070789485115673378358910721836523705228342522765259149483926262749352308756271663677642707808553125547759262249260137956458582647262884316682820344082621587352509474821454562914167947934424215081485359851939782157676804786878147196113715900882368515524907760095538901346972087553928260082213417238564249521072107922985770542584871947889959445775752392457881644187302087292744490123200634360706776928674086857077921971938849341729493382618565849243343082356070552232894357269395439001414967941973470614068840020787810668144923643167599119362601203749873141201667081144827745950582679776819547252150554110251650893792505311932361448742918085532906641385515091995513116714089084910674992495135572222620191476574517006462096813525273923080661556341249039970105404856690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099757477' --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":"19639989373482226804455913197798994149482600500417946910784070789485115673378358910721836523705228342522765259149483926262749352308756271663677642707808553125547759262249260137956458582647262884316682820344082621587352509474821454562914167947934424215081485359851939782157676804786878147196113715900882368515524907760095538901346972087553928260082213417238564249521072107922985770542584871947889959445775752392457881644187302087292744490123200634360706776928674086857077921971938849341729493382618565849243343082356070552232894357269395439001414967941973470614068840020787810668144923643167599119362601203749873141201667081144827745950582679776819547252150554110251650893792505311932361448742918085532906641385515091995513116714089084910674992495135572222620191476574517006462096813525273923080661556341249039970105404856690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099756690997566909975669099757477"},"decimal":false,"detail":2}}'