factordbrpc · fdb
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Inverse home prime · Base 19 of 2189 length 15 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
0 Fully factored 4 2189 11×199
1 Fully factored 4 3792 24×3×79
2 Fully factored 9 196017264 24×32×29×73×643
3 Fully factored 16 3943516776…25<16> 3×52×17×4463×693021361
4 Fully factored 18 6194722097…08<18> 22×3×11×4692971285…69<16>
5 Fully factored 21 6115927109…21<21> 7×11×313×405781×62536782041<11>
6 Fully factored 23 2017985022…49<23> 13×293×11069×26731×129581×138179
7 Fully factored 25 2097728046…20<25> 22×5×151×281×2471928597…11<19>
8 Fully factored 28 2209587114…02<28> 2×6124173221<10>×1803988093…81<18>
9 Fully factored 29 5821247646…00<29> 22×53×7×40493×1060904699<10>×387161090587<12>
10 Fully factored 35 4031405850…37<35> 7×172×14713×303647×5625721×7928886829…49<15>
11 Fully factored 38 8256139763…57<38> 23×29×25541×101797×59230118501<11>×8037772770…23<15>
12 Fully factored 42 5740653636…28<42> 22×73×113×4751×18763081×1951690129…53<27>
13 Fully factored 46 2962885577…43<46> 3×292223×1149168461…31<16>×2941003435…37<25>
14 Composite 48 3062388949…68<48> 24×7×181×1285021×42556555417<11>×2762403133…17<27>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (27 digits) of term #14:
276240313395357023391650617
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 '2189' --type 69 --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":"2189"},"type":69,"part":"last20","fr":0}}'