factordbrpc · fdb
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Distinct-prime home prime, descending · Base 2 of 138 length 46 Not fully computed yet - the last known term is composite. ↓ .elf file
Show sequence-development graph
Term size (digits) across the sequence
How the sequence develops - decimal digits of each term vs iteration.
nStatus DigitsTermFactorization
26 Fully factored 14 5608346385…14<14> 2×11×7433×342963589
27 Fully factored 15 1798116946…90<15> 2×5×203117×88526167
28 Fully factored 15 7426113192…02<15> 2×3713056596…51<15>
29 Fully factored 16 1485222638…06<16> 2×127×5847333222…89<13>
30 Fully factored 16 2993834609…78<16> 2×34119023×43873393
31 Fully factored 17 1177717439…02<17> 2×7×9479×88746359567<11>
32 Fully factored 17 4652865136…54<17> 2×13×17×59×1784210881…93<13>
33 Fully factored 18 2338600886…70<18> 2×5×101×2315446422…27<15>
34 Fully factored 18 9484068545…46<18> 2×3×80429×155627×12628327
35 Fully factored 19 6942496514…58<19> 2×59×5883471622…81<17>
36 Fully factored 20 1506168735…74<20> 2×167×691×6526030725…71<14>
37 Fully factored 20 6843039194…50<20> 2×52×1083541×1263088188…91<13>
38 Fully factored 20 8476441346…58<20> 2×24841×1706139315…19<16>
39 Fully factored 21 2236270923…34<21> 2×7×168673753×94699758877<11>
40 Fully factored 21 8134647346…10<21> 2×5×17×22866121×209265343883<12>
41 Fully factored 22 7190302465…14<22> 2×941×8069×4734867443…83<15>
42 Fully factored 23 1588757876…46<23> 2×137×4493×47969×269035797487<12>
43 Fully factored 24 1479039938…90<24> 2×3×5×97×3407×60394963×247009729
44 Fully factored 25 1112432927…14<25> 2×43×157×1427×2821909×20460147199<11>
45 Composite 26 1151803891…78<26> 2×5759019456…39<25>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (25 digits) of term #45:
5759019456524493745934039
Check for factors - let the server run a small P-1 / P+1 / ECM step on the composite:
level 0 done · takes up to a minute
From the command linefdb · curl
fdb
fdb seq view '138' --type 130 --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":"138"},"type":130,"part":"last20","fr":0}}'