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 '5241286947647933252036541548319822896974377339877830779557705160115490897723431148542423036906436184462482326060840181769962422771503638721234717462571637249379214681190610123048527465778708119756347017755909410244082413272965974369626007081900732120292810436543337633468451415213143024184480832063486660849816090621495033706984853603752221927984014749101059058816497682097774763244984918218420727788814029528310842373675438434934339171585633376506108898317249534341025064216859347013109284160252486236558661164801139087851653667667844570871547993006534559238988741985866191983271454365405480955615487168586805800125849084032092474250435953959380648613924646410256185098423110845614384200111774669405405442047890698576484031387764525907501693963516026389421232622563285027968566505827755395431171200306168079567151232277895170424726583081156719953625173843209077259530057162581069532018588710633724609736173675844761989904440067490983475074409480509619601767278906242717305465840683919009109295730345470005482404422911034703923755315214977878676902607653195630537787468375269407295962685952756367792374876597992436564062020929765761427787735364281231514507382325727060697738092728550266378801492621855983202510529436881150576253259199449598779738443509009651955511969109032248976728754171918756603166959225735383751532805407261277349254409865023119648145393635752667669586890240393895313214768864371593308436270753222031581575834271' --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":"5241286947647933252036541548319822896974377339877830779557705160115490897723431148542423036906436184462482326060840181769962422771503638721234717462571637249379214681190610123048527465778708119756347017755909410244082413272965974369626007081900732120292810436543337633468451415213143024184480832063486660849816090621495033706984853603752221927984014749101059058816497682097774763244984918218420727788814029528310842373675438434934339171585633376506108898317249534341025064216859347013109284160252486236558661164801139087851653667667844570871547993006534559238988741985866191983271454365405480955615487168586805800125849084032092474250435953959380648613924646410256185098423110845614384200111774669405405442047890698576484031387764525907501693963516026389421232622563285027968566505827755395431171200306168079567151232277895170424726583081156719953625173843209077259530057162581069532018588710633724609736173675844761989904440067490983475074409480509619601767278906242717305465840683919009109295730345470005482404422911034703923755315214977878676902607653195630537787468375269407295962685952756367792374876597992436564062020929765761427787735364281231514507382325727060697738092728550266378801492621855983202510529436881150576253259199449598779738443509009651955511969109032248976728754171918756603166959225735383751532805407261277349254409865023119648145393635752667669586890240393895313214768864371593308436270753222031581575834271"},"decimal":false,"detail":2}}'