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.

FF · Fully factored
below threshold 4 digits
★
Interesting number. 1722 = 2*3*7*41, the third Giuga number (each prime p divides n/p-1) - the only kind of composite that could break Giuga's 1950 primality conjecture.

Value

1722
2×3×7×41
‹ prev prime next prime ›
↪
Term #1 of the Home prime · Base 5 sequence of 582 · 7 terms
Term #1 of the Inverse home prime · Base 2 sequence of 428 · 2 terms
Term #1 of the Inverse home prime · Base 3 sequence of 573 · 3 terms
Term #1 of the Inverse home prime · Base 4 sequence of 428 · 39 terms
Term #1 of the Inverse home prime · Base 9 sequence of 573 · 25 terms
Term #1 of the Inverse home prime · Base 10 sequence of 68 · 46 terms
Term #1 of the Home prime · Base 17 sequence of 1385 · 22 terms
Term #3 of the Aliquot variants · Unitary · σ*(n) − n sequence of 1110 · 20 terms
Term #5 of the Aliquot variants · Bi-unitary · σ**(n) − n sequence of 894 · 17 terms
Term #5 of the Aliquot variants · Infinitary · σ∞(n) − n sequence of 894 · 23 terms
Term #1 of the Inverse home prime · Base 17 sequence of 505 · 19 terms
Term #1 of the Inverse home prime · Base 29 sequence of 649 · 4 terms
Term #3 of the Conway climb · Base 5 sequence of 304 · 30 terms
Term #1 of the Conway climb · Base 8 sequence of 441 · 6 terms
Term #1 of the Conway climb · Base 17 sequence of 1385 · 15 terms
Term #1 of the Prime-stopping maps · σ(n) − 1 until a prime sequence of 1681 · 2 terms
Term #1 of the Distinct-prime home prime, descending · Base 3 sequence of 573 · 3 terms
Term #1 of the Mid-divisor concatenation · Base 10 sequence of 374 · 5 terms
Is factor of
From the command linefdb · curl
fdb
fdb number '1722' --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":"1722"},"decimal":false,"detail":2}}'