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 #2 of the Home prime · Base 5 sequence of
226
Term #1 of the Inverse home prime · Base 2 sequence of
1139
Term #1 of the Home prime · Base 24 sequence of
1299
Term #1 of the Home prime · Base 25 sequence of
363
Term #1 of the Home prime · Base 28 sequence of
1186
Term #1 of the Home prime · Base 29 sequence of
958
Term #1 of the Home prime · Base 31 sequence of
478
Term #1 of the Home prime · Base 32 sequence of
102
Term #1 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of
1818
Term #1 of the Inverse home prime · Base 17 sequence of
254
Term #1 of the Inverse home prime · Base 26 sequence of
249
Term #1 of the Inverse home prime · Base 32 sequence of
1139
Term #2 of the Conway climb · Base 24 sequence of
192
Term #1 of the Conway climb · Base 26 sequence of
375
Term #1 of the Conway climb · Base 28 sequence of
1186
Term #1 of the Conway climb · Base 29 sequence of
958
Term #1 of the Conway climb · Base 31 sequence of
478
Term #2 of the Conway climb · Base 32 sequence of
49
Term #1 of the Distinct-prime home prime, descending · Base 2 sequence of
1139
Term #2 of the Second-class home prime · Base 16 sequence of
1518
Term #1 of the Mid-divisor concatenation · Base 2 sequence of
1617
Term #2 of the Mid-divisor concatenation · Base 3 sequence of
901
Term #1 of the Mid-divisor concatenation · Base 8 sequence of
452
Term #1 of the Mid-divisor concatenation · Base 10 sequence of
1281
Term #1 of the Mid-divisor concatenation · Base 16 sequence of
904
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '2161' --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":"2161"},"decimal":false,"detail":2}}'