Open
Show sequence-development graph
| n | Status | Digits | Term | Factorization |
|---|---|---|---|---|
| 1 | Fully factored | 2 | 40 | 23×5 |
| 2 | Fully factored | 3 | 280 | 23×5×7 |
| 3 | Fully factored | 4 | 3087 | 32×73 |
| 4 | Fully factored | 4 | 4315 | 5×863 |
| 5 | Fully factored | 4 | 7518 | 2×3×7×179 |
| 6 | Fully factored | 6 | 375521 | 23×29×563 |
| 7 | Fully factored | 7 | 3743335 | 5×401×1867 |
| 8 | Fully factored | 9 | 103308763 | 71×1455053 |
| 9 | Fully factored | 9 | 127235884 | 22×2549×12479 |
| 10 | Fully factored | 10 | 5181945532<10> | 22×14653×88411 |
| 11 | Fully factored | 12 | 624858159138<12> | 2×3×276587×376529 |
| 12 | Fully factored | 14 | 7895070053…61<14> | 271×115001×2533291 |
| 13 | Fully factored | 15 | 8527551367…53<15> | 3×7369×38573987279<11> |
| 14 | Fully factored | 17 | 1463424478…91<17> | 6287×2327699186…93<13> |
| 15 | Fully factored | 17 | 1973362690…20<17> | 22×5×23×337153×127239529 |
| 16 | Fully factored | 20 | 1236928385…74<20> | 2×3×359×461×1245655447…71<14> |
| 17 | Fully factored | 22 | 1545489141…36<22> | 22×32×72×109×76081×105648823981<12> |
| 18 | Fully factored | 25 | 1977656498…59<25> | 132×53×58763×3757373145…49<16> |
| 19 | Fully factored | 26 | 1183929988…60<26> | 25×5×2221129×71161579×468151781 |
| 20 | Composite | 28 | 2975741931…11<28> | 2975741931…11<28> |
| ↳ | Open Open - the last known term is composite and not yet fully factored. | |||
Open end - submit a factor of the remaining composite
(28 digits) of term #20:
2975741931314657439836379311
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 96 --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":96,"part":"last20","fr":0}}'