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.
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See the expression syntax & functions reference.
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Term #1 of the Home prime · Base 6 sequence of
3126
Term #1 of the Inverse home prime · Base 3 sequence of
13306
Term #3 of the Inverse home prime · Base 5 sequence of
1126
Term #1 of the Inverse home prime · Base 10 sequence of
12139
Term #1 of the Home prime · Base 12 sequence of
10483
Term #2 of the Home prime · Base 18 sequence of
706
Term #1 of the Home prime · Base 21 sequence of
330
Term #1 of the Aliquot variants · Quasi · σ(n) − n − 1 sequence of
10530
Term #1 of the Inverse home prime · Base 12 sequence of
8315
Term #1 of the Inverse home prime · Base 14 sequence of
12221
Term #1 of the Inverse home prime · Base 22 sequence of
6349
Term #1 of the Inverse home prime · Base 25 sequence of
7843
Term #1 of the Inverse home prime · Base 34 sequence of
1761
Term #1 of the Conway climb · Base 6 sequence of
1602
Term #1 of the Conway climb · Base 12 sequence of
10483
Term #3 of the Conway climb · Base 18 sequence of
162
Term #1 of the Conway climb · Base 21 sequence of
330
Term #1 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of
13306
Term #2 of the Distinct-prime home prime, descending · Base 3 sequence of
8938
Term #1 of the Distinct-prime home prime, descending · Base 10 sequence of
12139
Term #2 of the Second-class home prime · Base 16 sequence of
3704
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '19961' --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":"19961"},"decimal":false,"detail":2}}'