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 '620871799842406625135516903809985120426327518971990734946501781292266220643327814199284734838330596235145374161507658907272986831395957243199410173591571006976842441914632438589496213327662698708813492115768967285162305520399354897194434068283576298666782286171354227732182841711216664141514260330392738677880130560067283601251274898289813861362693130245404555308562466151819778586900516389383989594054319441662990234654614597531991913119324455074119088098523333456039989096402773515237731318452485918076280851862154605713596830929835631420075607981305234530737003366802582983988636739514473236826076439854810393128515819891364529004612391359124101018694083391547034697120535363267589253038449814233720688573636936238782030213503850036463140704323198473181432815125681663819711005434083302045548540122557389295439946874742768193' --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":"620871799842406625135516903809985120426327518971990734946501781292266220643327814199284734838330596235145374161507658907272986831395957243199410173591571006976842441914632438589496213327662698708813492115768967285162305520399354897194434068283576298666782286171354227732182841711216664141514260330392738677880130560067283601251274898289813861362693130245404555308562466151819778586900516389383989594054319441662990234654614597531991913119324455074119088098523333456039989096402773515237731318452485918076280851862154605713596830929835631420075607981305234530737003366802582983988636739514473236826076439854810393128515819891364529004612391359124101018694083391547034697120535363267589253038449814233720688573636936238782030213503850036463140704323198473181432815125681663819711005434083302045548540122557389295439946874742768193"},"decimal":false,"detail":2}}'