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 '439908206321620084542707134706305184311762429354607395901640190666458943922368645767774574851349999258124573708715602069942288224376916377063692445593053945399038954537213144480277661864879492788194295157128462912396436440157667255893905261986401477471928655744201029601951151830736582697567733245390596896333933427743910005500694496661881117099252406681840036709330726105982628294017579206449190351166882595666164811404746135320529683845633132561801960758751716880499994051975672010631865287722382824330542140059253747211907301640614015839994765231119904862624172546337261719523562514427696138540883706842540372446828393389691644127159517555199174656640387070734693603640230143578649493628911165091920894388178988320122542009209088312960482896872212531674992758979627875401286791234677843525804272718309663433120442837925520848887884057342364880186485296065622149651319593809811439042350859430297297135334091255971991126055527290658737510611524265586156168402027269783252588824991004228740291189398363402111861316136786002051291740917549347794982033654784385966403419289720070706823492065472641923729450596524937237188270710421032748033899731786535943064095343268065535743744500730848695306685585794864122481914942807631952721531429747934948716732877132246943086146288669255656432054656221873397643713306898772967339030539588553482227792831235354078492957964267630989795190026017356061012448614306736744707741807253537841' --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":"439908206321620084542707134706305184311762429354607395901640190666458943922368645767774574851349999258124573708715602069942288224376916377063692445593053945399038954537213144480277661864879492788194295157128462912396436440157667255893905261986401477471928655744201029601951151830736582697567733245390596896333933427743910005500694496661881117099252406681840036709330726105982628294017579206449190351166882595666164811404746135320529683845633132561801960758751716880499994051975672010631865287722382824330542140059253747211907301640614015839994765231119904862624172546337261719523562514427696138540883706842540372446828393389691644127159517555199174656640387070734693603640230143578649493628911165091920894388178988320122542009209088312960482896872212531674992758979627875401286791234677843525804272718309663433120442837925520848887884057342364880186485296065622149651319593809811439042350859430297297135334091255971991126055527290658737510611524265586156168402027269783252588824991004228740291189398363402111861316136786002051291740917549347794982033654784385966403419289720070706823492065472641923729450596524937237188270710421032748033899731786535943064095343268065535743744500730848695306685585794864122481914942807631952721531429747934948716732877132246943086146288669255656432054656221873397643713306898772967339030539588553482227792831235354078492957964267630989795190026017356061012448614306736744707741807253537841"},"decimal":false,"detail":2}}'