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 9 sequence of
148
Term #1 of the Inverse home prime · Base 5 sequence of
662
Term #1 of the Inverse home prime · Base 11 sequence of
637
Term #3 of the Home prime · Base 12 sequence of
254
Term #1 of the Home prime · Base 18 sequence of
185
Term #1 of the Home prime · Base 26 sequence of
418
Term #1 of the Home prime · Base 27 sequence of
398
Term #1 of the Home prime · Base 28 sequence of
30
Term #1 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of
864
Term #1 of the Inverse home prime · Base 28 sequence of
295
Term #1 of the Conway climb · Base 9 sequence of
148
Term #3 of the Conway climb · Base 12 sequence of
254
Term #1 of the Conway climb · Base 18 sequence of
185
Term #1 of the Conway climb · Base 26 sequence of
418
Term #1 of the Conway climb · Base 27 sequence of
398
Term #1 of the Conway climb · Base 28 sequence of
30
Term #4 of the Second-class home prime · Base 10 sequence of
1000
Term #4 of the Second-class home prime · Base 16 sequence of
820
Term #2 of the Mid-divisor concatenation · Base 2 sequence of
802
Term #1 of the Mid-divisor concatenation · Base 3 sequence of
740
Term #2 of the Mid-divisor concatenation · Base 8 sequence of
802
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '1657' --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":"1657"},"decimal":false,"detail":2}}'