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 '20298442401778721766238417965196887920870741320590859480365836740010944558158406049801555993818492609715852624708574485317757114506268884005509686590331388369940763406135392361091489364456113114196985465094592782388595969010573772079688480445214113576849954365087081581350675962152297884327038762685638073180807998084640263960874745531835800738332011815094454903322653' --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":"20298442401778721766238417965196887920870741320590859480365836740010944558158406049801555993818492609715852624708574485317757114506268884005509686590331388369940763406135392361091489364456113114196985465094592782388595969010573772079688480445214113576849954365087081581350675962152297884327038762685638073180807998084640263960874745531835800738332011815094454903322653"},"decimal":false,"detail":2}}'