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 '656765286984128577934727853392598616694568952450143798440848793202320937351932995511825863163608495014807959750836842608041821961076681534814160815802374074703147742482952985934769165805485720107516125547220422155311949468649894559090787717248500917713786395734474352568957233800370723816644766098735042882156594019155979436808277468664562730096695896931392711994803179301089047259372935556663932861638523960700070806209114482840857102822636156404951364114030626600320200700661005388288705848306277853568840591108843611019009855999502643707474093523798543482237088279554805318982647683545953075655186221736624295831954502381792894699940659870083490979148148056687326705376505433052254332176774165203101411413378663296022206989603897416238390988412984905437493203745922768095882088039218077877790409386934279569778992306577620542010466260032322703986551' --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":"656765286984128577934727853392598616694568952450143798440848793202320937351932995511825863163608495014807959750836842608041821961076681534814160815802374074703147742482952985934769165805485720107516125547220422155311949468649894559090787717248500917713786395734474352568957233800370723816644766098735042882156594019155979436808277468664562730096695896931392711994803179301089047259372935556663932861638523960700070806209114482840857102822636156404951364114030626600320200700661005388288705848306277853568840591108843611019009855999502643707474093523798543482237088279554805318982647683545953075655186221736624295831954502381792894699940659870083490979148148056687326705376505433052254332176774165203101411413378663296022206989603897416238390988412984905437493203745922768095882088039218077877790409386934279569778992306577620542010466260032322703986551"},"decimal":false,"detail":2}}'