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
462
Term #1 of the Home prime · Base 4 sequence of
1255
Term #1 of the Home prime · Base 5 sequence of
124
Term #2 of the Home prime · Base 8 sequence of
130
Term #2 of the Inverse home prime · Base 8 sequence of
355
Term #1 of the Inverse home prime · Base 11 sequence of
278
Term #1 of the Home prime · Base 16 sequence of
1255
Term #2 of the Home prime · Base 20 sequence of
386
Term #2 of the Home prime · Base 22 sequence of
35
Term #1 of the Home prime · Base 24 sequence of
758
Term #1 of the Home prime · Base 25 sequence of
562
Term #1 of the Home prime · Base 26 sequence of
358
Term #2 of the Home prime · Base 27 sequence of
55
Term #1 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of
1278
Term #1 of the Inverse home prime · Base 12 sequence of
889
Term #1 of the Inverse home prime · Base 14 sequence of
545
Term #1 of the Conway climb · Base 2 sequence of
462
Term #1 of the Conway climb · Base 4 sequence of
1255
Term #1 of the Conway climb · Base 5 sequence of
124
Term #2 of the Conway climb · Base 8 sequence of
130
Term #1 of the Conway climb · Base 16 sequence of
1255
Term #2 of the Conway climb · Base 20 sequence of
386
Term #1 of the Conway climb · Base 22 sequence of
237
Term #1 of the Conway climb · Base 24 sequence of
758
Term #1 of the Conway climb · Base 25 sequence of
562
Term #1 of the Conway climb · Base 26 sequence of
358
Term #2 of the Conway climb · Base 27 sequence of
55
Term #1 of the Distinct-prime home prime · Base 2 sequence of
462
Term #2 of the Distinct-prime home prime · Base 8 sequence of
130
Term #1 of the Distinct-prime home prime · Base 16 sequence of
1255
Term #2 of the Distinct-prime home prime, descending · Base 8 sequence of
355
Term #1 of the Second-class home prime · Base 2 sequence of
924
Term #9 of the Mid-divisor concatenation · Base 2 sequence of
27
Term #1 of the Mid-divisor concatenation · Base 3 sequence of
1314
Term #1 of the Mid-divisor concatenation · Base 8 sequence of
1357
Term #1 of the Mid-divisor concatenation · Base 10 sequence of
465
Term #1 of the Mid-divisor concatenation · Base 16 sequence of
1255
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '1531' --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":"1531"},"decimal":false,"detail":2}}'