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 '2851355560323963635927802326747087792994114979144868116678229080268669466926320477020735307782585487565875421363993721538643616660131092300788862701009236138552670248179089586162525000831384700618224538958627572012296300033002327712815288262998748630934498147366911604997457453482208659093094677406961201776683585758807538516422083179451642636238230697641975852424848459686064858796929005350212670977136665755326178224891821251771630143420802798393437691339311898976618772068226749099917868700156051653607074447763455993113950344020713367623482668226316029866121533322570607996252727602038431882508073955773258569422861019378432006156944192131130462974580765806975306101659325331334888689973289040374653734092911217545845583099267574826463886076853515818210935990071874346253494710109997971548291193121433984508246058800929021306811446390455437822063396940148844214027981483541474632295108191334764661536426702402795738335394315789170652917204570046207677635110566679562364201577836729007658438695526430452750059053758911546030648793878144355224597228365919761797554175031749525275075562251791522677161157775058270314017535703182224131664836808569784922513817924947474120838374610956746556237194517861233199171749058540678064037940483763466816429935449479522558162136595037686991546265113947' --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":"2851355560323963635927802326747087792994114979144868116678229080268669466926320477020735307782585487565875421363993721538643616660131092300788862701009236138552670248179089586162525000831384700618224538958627572012296300033002327712815288262998748630934498147366911604997457453482208659093094677406961201776683585758807538516422083179451642636238230697641975852424848459686064858796929005350212670977136665755326178224891821251771630143420802798393437691339311898976618772068226749099917868700156051653607074447763455993113950344020713367623482668226316029866121533322570607996252727602038431882508073955773258569422861019378432006156944192131130462974580765806975306101659325331334888689973289040374653734092911217545845583099267574826463886076853515818210935990071874346253494710109997971548291193121433984508246058800929021306811446390455437822063396940148844214027981483541474632295108191334764661536426702402795738335394315789170652917204570046207677635110566679562364201577836729007658438695526430452750059053758911546030648793878144355224597228365919761797554175031749525275075562251791522677161157775058270314017535703182224131664836808569784922513817924947474120838374610956746556237194517861233199171749058540678064037940483763466816429935449479522558162136595037686991546265113947"},"decimal":false,"detail":2}}'