factordbrpc · fdb
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Distinct-prime home prime, descending · Base 2 of 1618 length 49 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
29 Fully factored 17 4192778081…62<17> 2×24419×550279×1560131
30 Fully factored 18 2144228440…98<18> 2×11×15583×625456774123<12>
31 Fully factored 18 6558389623…06<18> 2×3×149×7642007×95995807
32 Fully factored 19 3298390844…46<19> 2×19×243532141×356420137
33 Fully factored 20 1224650268…42<20> 2×6827×9811×91419513943<11>
34 Fully factored 20 4908047782…74<20> 2×997×2461408115…71<17>
35 Fully factored 21 1008192764…06<21> 2×43×2609×4493358250…69<15>
36 Fully factored 21 4711627621…22<21> 2×3×14741×5327123466…57<16>
37 Fully factored 22 1396473453…78<22> 2×19×23×1597795713…47<19>
38 Fully factored 22 6544571244…34<22> 2×3×47×67×1453×76717×3107420761<10>
39 Fully factored 24 1093326483…94<24> 2×47×32028615041<11>×36314816561<11>
40 Fully factored 24 3194285045…74<24> 2×192×23144659×1911550096…13<14>
41 Fully factored 23 8210045149…78<23> 2×226357×1813516955…27<18>
42 Fully factored 24 1901610355…82<24> 2×7×516757×2628494845…09<17>
43 Fully factored 24 4409882577…98<24> 2×3×1109×6627415956…37<20>
44 Fully factored 25 2171671660…74<25> 2×112×61×179×8218563821…13<18>
45 Fully factored 24 8617788778…22<24> 2×3×1436298129…37<24>
46 Fully factored 25 2298077007…06<25> 2×3×11×3481934859…91<23>
47 Fully factored 25 8913753241…86<25> 2×103×757×22417981×2549770021…93<13>
48 Composite 26 4485602859…14<26> 2×2242801429…07<26>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (26 digits) of term #48:
22428014298693642736825807
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 '1618' --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":"1618"},"type":130,"part":"last20","fr":0}}'