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 '1661647358072182822988388641043920403288705641082842537723041091997121224481262992159279970504631724031525072254555115332012689640319984727576249941626893639132742426110813675222396890167420798071422101499728615206154922685436079701450348479624666856831845145491373183457130724628247041679145208920056638537498518870991905097500431678832400587194898270737767367002482460180238392030294683682001724721808204545353414291012167261257998856291617773894665587255749072141363348147795988314156390596270638805088716351938081559626019917414783826350471561023008265214441559169265332285187809882352683209900240583670573780152559261211307178156996328062725097335206882808992922028947030870931521768621138115808065894037681853648269383750323126207870116844548701140540068148804020625036971932837010497221942715543232591061251291225082883427366872519758594035785189172768569783365125589033994781817028145000544571231180254892418425696794182930368568305499152009775389960662490250719201587497175577122341181553523089578736810491402927535520344159461653643480363921686076459973' --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":"1661647358072182822988388641043920403288705641082842537723041091997121224481262992159279970504631724031525072254555115332012689640319984727576249941626893639132742426110813675222396890167420798071422101499728615206154922685436079701450348479624666856831845145491373183457130724628247041679145208920056638537498518870991905097500431678832400587194898270737767367002482460180238392030294683682001724721808204545353414291012167261257998856291617773894665587255749072141363348147795988314156390596270638805088716351938081559626019917414783826350471561023008265214441559169265332285187809882352683209900240583670573780152559261211307178156996328062725097335206882808992922028947030870931521768621138115808065894037681853648269383750323126207870116844548701140540068148804020625036971932837010497221942715543232591061251291225082883427366872519758594035785189172768569783365125589033994781817028145000544571231180254892418425696794182930368568305499152009775389960662490250719201587497175577122341181553523089578736810491402927535520344159461653643480363921686076459973"},"decimal":false,"detail":2}}'