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
810
Term #1 of the Home prime · Base 20 sequence of
8438
Term #1 of the Home prime · Base 21 sequence of
1734
Term #1 of the Inverse home prime · Base 14 sequence of
3193
Term #4 of the Inverse home prime · Base 18 sequence of
2321
Term #1 of the Inverse home prime · Base 26 sequence of
11339
Term #1 of the Inverse home prime · Base 30 sequence of
19517
Term #1 of the Conway climb · Base 6 sequence of
3144
Term #1 of the Conway climb · Base 20 sequence of
8438
Term #2 of the Conway climb · Base 21 sequence of
2149
Term #1 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of
19517
Term #2 of the Second-class home prime · Base 10 sequence of
6544
Term #2 of the Second-class home prime · Base 16 sequence of
18152
Term #3 of the Mid-divisor concatenation · Base 2 sequence of
9259
Term #3 of the Mid-divisor concatenation · Base 8 sequence of
2842
Term #2 of the Mid-divisor concatenation · Base 16 sequence of
9272
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '20219' --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":"20219"},"decimal":false,"detail":2}}'