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
2004
Term #1 of the Home prime · Base 20 sequence of
1862
Term #2 of the Inverse home prime · Base 12 sequence of
7235
Term #1 of the Inverse home prime · Base 20 sequence of
17993
Term #1 of the Inverse home prime · Base 28 sequence of
2031
Term #1 of the Inverse home prime · Base 30 sequence of
18299
Term #1 of the Conway climb · Base 6 sequence of
2004
Term #1 of the Conway climb · Base 18 sequence of
13527
Term #1 of the Conway climb · Base 20 sequence of
17024
Term #4 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of
2304
Term #5 of the Second-class home prime · Base 3 sequence of
7674
Term #5 of the Second-class home prime · Base 8 sequence of
7084
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '18959' --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":"18959"},"decimal":false,"detail":2}}'