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 #2 of the Home prime · Base 2 sequence of
314
Term #2 of the Home prime · Base 4 sequence of
116
Term #2 of the Inverse home prime · Base 2 sequence of
209
Term #1 of the Inverse home prime · Base 4 sequence of
549
Term #2 of the Home prime · Base 16 sequence of
314
Term #2 of the Home prime · Base 18 sequence of
9
Term #1 of the Home prime · Base 19 sequence of
538
Term #1 of the Home prime · Base 20 sequence of
382
Term #1 of the Home prime · Base 21 sequence of
218
Term #2 of the Home prime · Base 22 sequence of
4
Term #1 of the Aliquot variants · Augmented · σ(n) − n + 1 sequence of
978
Term #1 of the Inverse home prime · Base 23 sequence of
86
Term #1 of the Inverse home prime · Base 24 sequence of
287
Term #1 of the Inverse home prime · Base 34 sequence of
145
Term #2 of the Conway climb · Base 2 sequence of
240
Term #2 of the Conway climb · Base 4 sequence of
116
Term #1 of the Conway climb · Base 7 sequence of
704
Term #2 of the Conway climb · Base 16 sequence of
314
Term #2 of the Conway climb · Base 18 sequence of
27
Term #1 of the Conway climb · Base 19 sequence of
538
Term #2 of the Conway climb · Base 20 sequence of
361
Term #1 of the Conway climb · Base 21 sequence of
218
Term #2 of the Conway climb · Base 22 sequence of
4
Term #1 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of
336
Term #2 of the Distinct-prime home prime · Base 2 sequence of
314
Term #2 of the Distinct-prime home prime · Base 16 sequence of
314
Term #2 of the Mid-divisor concatenation · Base 2 sequence of
314
Term #2 of the Mid-divisor concatenation · Base 8 sequence of
119
Term #2 of the Mid-divisor concatenation · Base 16 sequence of
314
Is factor of
Primality
Verified directlyproven prime
Checked deterministically (below 300 digits).
From the command linefdb · curl
fdb
fdb number '991' --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":"991"},"decimal":false,"detail":2}}'