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 '778681937298163823113388167966355281620632286849564092291836045935082307074753236403614031674698394273501548497117728848944731617732014569445302204223496568908347182499822935901666529850020861656766420417777407483272838316615012146560027884879569908296049090643898813201338347081759775819219334833955855157389243377105300424425701431036320158786875574715959956228055085850155771481132240191374568211465203559443033759542566507307251526036376022214239663124027651776121891290296467554786412054076047607550525422781391510335654581337046123945130580708319237249267282671348433494000706890791165922262123782242838452733898144045504020042542597868823434793839202531342188412054589048835613695512220157850187210187073192152494560429233116564129678389388032545372599458588482132961365852898792153' --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":"778681937298163823113388167966355281620632286849564092291836045935082307074753236403614031674698394273501548497117728848944731617732014569445302204223496568908347182499822935901666529850020861656766420417777407483272838316615012146560027884879569908296049090643898813201338347081759775819219334833955855157389243377105300424425701431036320158786875574715959956228055085850155771481132240191374568211465203559443033759542566507307251526036376022214239663124027651776121891290296467554786412054076047607550525422781391510335654581337046123945130580708319237249267282671348433494000706890791165922262123782242838452733898144045504020042542597868823434793839202531342188412054589048835613695512220157850187210187073192152494560429233116564129678389388032545372599458588482132961365852898792153"},"decimal":false,"detail":2}}'