factordbrpc · fdb
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Distinct-prime home prime, descending · Base 2 of 1986 length 54 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
34 Fully factored 20 1240405719…94<20> 2×72×2308213×54835499231<11>
35 Fully factored 19 7359896120…14<19> 2×34×4543145753…47<17>
36 Fully factored 18 7269033205…66<18> 2×107×3089×13063×84178667
37 Fully factored 19 2892357001…30<19> 2×5×11×83×531701×595818031
38 Fully factored 20 4094430335…22<20> 2×32×883×20359×126533008807<12>
39 Fully factored 20 6793189183…82<20> 2×3×3539×3199203722…23<16>
40 Fully factored 21 2096630151…66<21> 2×32×23×6199×8169582250…31<14>
41 Fully factored 21 3426571151…94<21> 2×29×61×17659×5484484570…57<13>
42 Fully factored 22 1472230116…46<22> 2×419×521×5483×615000841219<12>
43 Fully factored 23 1056563400…98<23> 2×14446997×3656688653…67<15>
44 Fully factored 23 2453962215…78<23> 2×21757×28309×115751×172103453
45 Fully factored 23 9688563134…10<23> 2×5×7×43×3218791739…91<20>
46 Fully factored 24 5273668385…98<24> 2×3×89×149×503×4773019×2760731329<10>
47 Fully factored 25 6216614293…10<25> 2×32×5×6907349215…19<23>
48 Fully factored 25 8841406995…26<25> 2×22411303×1972533010…21<18>
49 Fully factored 26 2647488990…02<26> 2×17961467×7369913022…53<18>
50 Fully factored 26 9891729813…54<26> 2×13×53×443×1620389056…01<21>
51 Fully factored 27 3398202151…26<27> 2×3×79×33180029221<11>×2160698172…19<14>
52 Fully factored 28 1520456169…02<28> 2×3×2534093616…17<27>
53 Composite 28 4054549785…86<28> 2×3×37×1826373777…13<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 #53:
18263737774665058699582913
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 '1986' --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":"1986"},"type":130,"part":"last20","fr":0}}'