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 11 sequence of
45
Term #1 of the Home prime · Base 12 sequence of
226
Term #2 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of
324
Term #1 of the Inverse home prime · Base 21 sequence of
38
Term #1 of the Inverse home prime · Base 30 sequence of
143
Term #1 of the Inverse home prime · Base 36 sequence of
55
Term #1 of the Conway climb · Base 11 sequence of
135
Term #1 of the Conway climb · Base 12 sequence of
226
Term #1 of the Conway climb · Base 13 sequence of
176
Term #1 of the Conway climb · Base 21 sequence of
361
Term #2 of the Mid-divisor concatenation · Base 2 sequence of
144
Term #2 of the Mid-divisor concatenation · Base 3 sequence of
237
Term #1 of the Mid-divisor concatenation · Base 8 sequence of
102
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '401' --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":"401"},"decimal":false,"detail":2}}'