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 2 sequence of
1112
Term #1 of the Home prime · Base 4 sequence of
1112
Term #1 of the Home prime · Base 8 sequence of
1390
Term #1 of the Inverse home prime · Base 8 sequence of
4083
Term #1 of the Home prime · Base 16 sequence of
5398
Term #1 of the Home prime · Base 14 sequence of
7977
Term #1 of the Home prime · Base 17 sequence of
726
Term #1 of the Aliquot variants · Quasi · σ(n) − n − 1 sequence of
8080
Term #1 of the Inverse home prime · Base 12 sequence of
6349
Term #1 of the Inverse home prime · Base 17 sequence of
4477
Term #1 of the Conway climb · Base 2 sequence of
5398
Term #1 of the Conway climb · Base 4 sequence of
5398
Term #1 of the Conway climb · Base 8 sequence of
550
Term #1 of the Conway climb · Base 14 sequence of
7977
Term #1 of the Conway climb · Base 16 sequence of
5398
Term #1 of the Distinct-prime home prime · Base 2 sequence of
5398
Term #1 of the Distinct-prime home prime · Base 8 sequence of
1390
Term #1 of the Distinct-prime home prime · Base 16 sequence of
5398
Term #1 of the Distinct-prime home prime, descending · Base 8 sequence of
4083
Term #1 of the Second-class home prime · Base 2 sequence of
2224
Term #1 of the Second-class home prime · Base 8 sequence of
2780
Term #1 of the Second-class home prime · Base 16 sequence of
10796
Term #1 of the Mid-divisor concatenation · Base 2 sequence of
5398
Term #2 of the Mid-divisor concatenation · Base 3 sequence of
6033
Term #2 of the Mid-divisor concatenation · Base 8 sequence of
1795
Term #2 of the Mid-divisor concatenation · Base 16 sequence of
462
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '10891' --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":"10891"},"decimal":false,"detail":2}}'