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 '648447720176962493048459600023859843180822963977042364548658835018444074216498377630038157737919868204467319999018746257515566104164262589354961462931447439044464047523594265130038112066567438244329585679184003897688152439868845917879679736979999449715935197636596664030046942122645415518176467951664879290824494502906652011336931790496222977574279963896464817127298041934338164601004837432660361387741205066965849876310883247065324379499186013717657361746384843771364139004501618560224089106703996946877018145813734851396743283967321337353573449868245361877870030770529223814325239823709735362541468162220434935735718115327050512420601009106571268470175569075826002948002432659690062662815073513173095761550923549081611611074232841548366200638731088566090410152440922299254154204478667757397486927443609311996801320939044380890153033975415504434914038572133283842378166681954296807449901126286913944426643456000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001911' --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":"648447720176962493048459600023859843180822963977042364548658835018444074216498377630038157737919868204467319999018746257515566104164262589354961462931447439044464047523594265130038112066567438244329585679184003897688152439868845917879679736979999449715935197636596664030046942122645415518176467951664879290824494502906652011336931790496222977574279963896464817127298041934338164601004837432660361387741205066965849876310883247065324379499186013717657361746384843771364139004501618560224089106703996946877018145813734851396743283967321337353573449868245361877870030770529223814325239823709735362541468162220434935735718115327050512420601009106571268470175569075826002948002432659690062662815073513173095761550923549081611611074232841548366200638731088566090410152440922299254154204478667757397486927443609311996801320939044380890153033975415504434914038572133283842378166681954296807449901126286913944426643456000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001911"},"decimal":false,"detail":2}}'