factordbrpc · fdb
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Distinct-prime home prime, descending · Base 2 of 2858 length 44 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
24 Fully factored 15 2290661175…66<15> 2×11×1041209625…53<14>
25 Fully factored 15 6663741602…38<15> 2×1087×58271×5260247
26 Fully factored 16 2824074081…46<16> 2×11×1283670037…93<15>
27 Fully factored 16 8215488237…98<16> 2×3×17×3926641×20512189
28 Fully factored 17 4404959247…50<17> 2×52×72×1797942549…31<14>
29 Fully factored 16 4602732927…82<16> 2×17923×128402971817<12>
30 Fully factored 17 1683003432…18<17> 2×11×19×4260677×9449963
31 Fully factored 18 1623491368…50<18> 2×52×11×53×5569438657…73<13>
32 Fully factored 18 1824993659…74<18> 2×397×601×382442708671<12>
33 Fully factored 18 8020404913…30<18> 2×5×11×7291277194…13<16>
34 Fully factored 19 3733133923…30<19> 2×3×5×7×19×27007859×34642603
35 Fully factored 20 3808994569…86<20> 2×3×7×751×24677×48936033529<11>
36 Fully factored 21 2101786636…82<21> 2×59×2423×7351114796…63<15>
37 Fully factored 21 7708202549…14<21> 2×1213×3177329987…39<18>
38 Fully factored 22 2602868725…42<22> 2×11×90437×3151847×415067099
39 Fully factored 23 1460387527…58<23> 2×17606753873<11>×414723673223<12>
40 Fully factored 23 5699918762…50<23> 2×53×167×17749×6584867×11681303
41 Fully factored 23 2630395768…70<23> 2×5×149×1765366287…83<20>
42 Fully factored 24 1446188062…26<24> 2×3×19×2647×3709×12841×10062602113<11>
43 Composite 25 1416185347…86<25> 2×7080926739…43<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 #43:
708092673906473778698143
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 '2858' --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":"2858"},"type":130,"part":"last20","fr":0}}'