P · Proven 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.
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Term #1 of the Home prime · Base 6 sequence of
725
Term #1 of the Home prime · Base 18 sequence of
951
Term #1 of the Home prime · Base 20 sequence of
267
Term #1 of the Home prime · Base 24 sequence of
170
Term #1 of the Aliquot variants · Quasi · σ(n) − n − 1 sequence of
870
Term #1 of the Inverse home prime · Base 12 sequence of
535
Term #2 of the Inverse home prime · Base 18 sequence of
301
Term #2 of the Inverse home prime · Base 24 sequence of
481
Term #1 of the Inverse home prime · Base 34 sequence of
1147
Term #1 of the Conway climb · Base 18 sequence of
951
Term #1 of the Conway climb · Base 20 sequence of
267
Term #2 of the Conway climb · Base 24 sequence of
49
Term #1 of the Mid-divisor concatenation · Base 10 sequence of
1068
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '1289' --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":"1289"},"decimal":false,"detail":2}}'