factordbrpc · fdb
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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.

P · Proven prime
below threshold 5 digits
↪
Term #1 of the aliquot sequence of 298969 · 2 terms
Term #1 of the Home prime · Base 6 sequence of 9741 · 2 terms
Term #1 of the Home prime · Base 10 sequence of 2674 · 2 terms
Term #2 of the Inverse home prime · Base 4 sequence of 3715 · 3 terms
Term #1 of the Inverse home prime · Base 7 sequence of 3081 · 2 terms
Term #2 of the Home prime · Base 20 sequence of 8579 · 3 terms
Term #1 of the Home prime · Base 21 sequence of 17338 · 2 terms
Term #1 of the Home prime · Base 23 sequence of 5714 · 2 terms
Term #1 of the Aliquot variants · Quasi · σ(n) − n − 1 sequence of 16008 · 2 terms
Term #2 of the Inverse home prime · Base 16 sequence of 3715 · 3 terms
Term #1 of the Inverse home prime · Base 20 sequence of 14003 · 2 terms
Term #1 of the Inverse home prime · Base 28 sequence of 2913 · 2 terms
Term #1 of the Conway climb · Base 6 sequence of 8595 · 2 terms
Term #1 of the Conway climb · Base 10 sequence of 2674 · 2 terms
Term #2 of the Conway climb · Base 20 sequence of 8579 · 3 terms
Term #1 of the Conway climb · Base 21 sequence of 17338 · 2 terms
Term #1 of the Conway climb · Base 23 sequence of 5714 · 2 terms
Term #2 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of 22105 · 3 terms
Term #1 of the Distinct-prime home prime · Base 10 sequence of 2674 · 2 terms
Term #2 of the Distinct-prime home prime, descending · Base 16 sequence of 3715 · 3 terms
Term #4 of the Second-class home prime · Base 3 sequence of 7770 · 5 terms
Term #7 of the Second-class home prime · Base 8 sequence of 11664 · 8 terms
Term #1 of the Second-class home prime · Base 10 sequence of 5348 · 2 terms
Term #2 of the Second-class home prime · Base 16 sequence of 1444 · 3 terms
Term #1 of the Mid-divisor concatenation · Base 3 sequence of 11364 · 2 terms
Term #2 of the Mid-divisor concatenation · Base 10 sequence of 785 · 3 terms
Is factor of

Primality

Verified directlyproven prime

Checked deterministically (below 300 digits).

From the command linefdb · curl
fdb
fdb number '27191' --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":"27191"},"decimal":false,"detail":2}}'