factordbrpc · fdb
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Inverse home prime · Base 18 of 4953 length 22 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
2 Fully factored 7 9353001 3×7×257×1733
3 Fully factored 9 182006805 3×5×12133787
4 Fully factored 10 3931347081<10> 3×1310449027<10>
5 Fully factored 11 23588082489<11> 3×32059×245257
6 Fully factored 12 463430356041<12> 3×199×776265253
7 Fully factored 13 4527178959…81<13> 3×1509059653…27<13>
8 Fully factored 14 2716307375…89<14> 3×1393967×6495389
9 Fully factored 15 2209226507…45<15> 3×5×254053×57972851
10 Fully factored 17 3549214077…97<17> 3×14551×813051583549<12>
11 Fully factored 19 1536316254…53<19> 3×3863×27077×4895917801<10>
12 Fully factored 20 5395282115…65<20> 3×5×509×3391×53309×39091001
13 Fully factored 23 4522169727…57<23> 3×13×59×1965306270…57<20>
14 Fully factored 25 2063099910…85<25> 3×5×708907×1940169782…77<18>
15 Fully factored 27 1187810806…25<27> 3×52×23×6803×1012179883…31<20>
16 Fully factored 31 2007752834…61<31> 3×6553357×1021233765…91<24>
17 Fully factored 32 6252197687…41<32> 3×41×859×8140455419<10>×7269185036…27<17>
18 Fully factored 35 2724587723…33<35> 3×13×17×167×2460768709…73<30>
19 Fully factored 36 4649789809…53<36> 3×7×139×172306243×9244814753…09<24>
20 Fully factored 38 5941495457…21<38> 3×23×8610862981…09<36>
21 Composite 40 5021855290…05<40> 3×5×3347903527…27<39>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (39 digits) of term #21:
334790352715116617701988062250963897927
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 '4953' --type 68 --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":"4953"},"type":68,"part":"last20","fr":0}}'