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.
Prove by special form
A Pocklington (N-1) or Morrison (N+1) test proves this prime once enough of N-1 or N+1 is factored (⅓ suffices, via Brillhart-Lehmer-Selfridge). The two numbers are tracked below and factored over time; each bar shows how close its proof is.
Checking N-1 / N+1 factorization…
Or prove it with a certificate
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 id:1100000000213085881 --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":{"id":1100000000213085881},"decimal":false,"detail":2}}'