Open
Show sequence-development graph
| n | Status | Digits | Term | Factorization |
|---|---|---|---|---|
| 0 | Fully factored | 2 | 25 | 52 |
| 1 | Fully factored | 2 | 70 | 2×5×7 |
| 2 | Fully factored | 3 | 410 | 2×5×41 |
| 3 | Fully factored | 4 | 5280 | 25×3×5×11 |
| 4 | Fully factored | 9 | 135955337 | 7×131×173×857 |
| 5 | Fully factored | 10 | 6342807964<10> | 22×29×2663×20533 |
| 6 | Fully factored | 13 | 3883770041…57<13> | 32×47×139×467×141443 |
| 7 | Fully factored | 15 | 9851124843…98<15> | 2×7×49681×1416339797<10> |
| 8 | Fully factored | 18 | 1304602642…47<18> | 3×4348675475…49<17> |
| 9 | Fully factored | 18 | 1970444338…20<18> | 23×5×4926110845…93<16> |
| 10 | Fully factored | 21 | 2438033345…84<21> | 23×3×1015847227…41<20> |
| 11 | Fully factored | 24 | 5354103509…10<24> | 2×5×241×349×4202269×151481795471<12> |
| 12 | Fully factored | 28 | 1298954290…89<28> | 3×11×10152011×123422297×31414794599<11> |
| 13 | Fully factored | 30 | 3539621492…21<30> | 139×8597×407119×7275682274…73<18> |
| 14 | Fully factored | 33 | 1661210895…72<33> | 27×17×283×2697611747…09<27> |
| 15 | Composite | 40 | 2107703078…39<40> | 23873×8828815310…43<35> |
| ↳ | Open Open - the last known term is composite and not yet fully factored. | |||
Open end - submit a factor of the remaining composite
(35 digits) of term #15:
88288153100112476166078537057218843
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 '25' --type 31 --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":"25"},"type":31,"part":"last20","fr":0}}'