Open
Show sequence-development graph
| n | Status | Digits | Term | Factorization |
|---|---|---|---|---|
| 0 | Fully factored | 2 | 21 | 3×7 |
| 1 | Fully factored | 3 | 154 | 2×7×11 |
| 2 | Fully factored | 4 | 5156 | 22×1289 |
| 3 | Fully factored | 5 | 39705 | 3×5×2647 |
| 4 | Fully factored | 6 | 439629 | 3×146543 |
| 5 | Fully factored | 7 | 2617172 | 22×654293 |
| 6 | Fully factored | 8 | 13830981 | 3×23×41×4889 |
| 7 | Fully factored | 9 | 140696286 | 2×3×47×498923 |
| 8 | Fully factored | 9 | 725216763 | 3×859×281419 |
| 9 | Fully factored | 10 | 6639685085<10> | 5×11×120721547 |
| 10 | Fully factored | 11 | 72434385291<11> | 3×24144795097<11> |
| 11 | Fully factored | 12 | 314811826318<12> | 2×11×653×3469×6317 |
| 12 | Fully factored | 14 | 7411082958…38<14> | 2×33×11×13×20639×465011 |
| 13 | Fully factored | 17 | 2843442243…06<17> | 2×32×263×6006426370…59<13> |
| 14 | Fully factored | 19 | 1388012584…25<19> | 52×5552050338…33<17> |
| 15 | Fully factored | 19 | 3007834356…70<19> | 2×5×13×3019×75149×101982169 |
| 16 | Fully factored | 21 | 5273676471…97<21> | 3×13×19×157×4533103373…81<16> |
| 17 | Fully factored | 23 | 3072907778…23<23> | 11×1571×1778200207…83<19> |
| 18 | Composite | 24 | 1094063907…01<24> | 1094063907…01<24> |
| ↳ | Open Open - the last known term is composite and not yet fully factored. | |||
Open end - submit a factor of the remaining composite
(24 digits) of term #18:
109406390781656362211501
Check for factors - let the server run a small P-1 / P+1 / ECM step on the composite:
From the command linefdb · curl
fdb
fdb seq view '21' --type 92 --part last20
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"sequence_view","params":{"start":{"expr":"21"},"type":92,"part":"last20","fr":0}}'