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 '247248723381157098312513695889838951423942808768493850758005597331258383218938617350718719557097121489125553918110378522623911413489534348325314613393868397099795988790391505188928613208205895010565247873541582116672162188108721137687145815420202762305733345596038171002539310889409152613738971831339094858569' --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":"247248723381157098312513695889838951423942808768493850758005597331258383218938617350718719557097121489125553918110378522623911413489534348325314613393868397099795988790391505188928613208205895010565247873541582116672162188108721137687145815420202762305733345596038171002539310889409152613738971831339094858569"},"decimal":false,"detail":2}}'