factordbrpc · fdb
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Home prime · Base 31 of 121 length 18 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 3 121 112
1 Fully factored 3 352 25×11
2 Fully factored 8 59166921 3×11×53×33829
3 Fully factored 11 92349363266<11> 2×541×85350613
4 Fully factored 13 2186006916…16<13> 22×41×137×823×118219
5 Fully factored 17 5249130124…44<17> 22×17×379×4391×463848097
6 Fully factored 20 5085238678…08<20> 22×144719×8784676991…33<14>
7 Fully factored 23 4856302772…96<23> 25×47×233×1385804599…53<18>
8 Fully factored 31 1388367080…63<31> 3×173×2675081079…77<28>
9 Fully factored 32 6622821882…53<32> 3×7×13×5422954451<10>×4473469403…11<20>
10 Fully factored 35 6483390627…85<35> 5×149×115415939×1400160893<10>×5385204293…59<15>
11 Fully factored 38 9914854852…95<38> 5×317×1054013×11142181×37458119×1421984795…81<15>
12 Fully factored 43 3053843207…46<43> 2×47×1123×6367×735988037×38113724359<11>×1619765452…03<15>
13 Fully factored 49 1084188626…08<49> 24×7×11×821×1071891882…39<43>
14 Fully factored 55 1009933137…86<55> 2×3×2073173×8119061438…97<47>
15 Fully factored 57 9857790746…65<57> 5×181×1789×1416284479<10>×4299027067…03<42>
16 Fully factored 61 2341541560…07<61> 32×11×79×2687×4723×86027×1895977001…47<14>×1446392395…43<32>
17 Composite 67 1295502720…53<67> 7×41×8377×5388500373…47<60>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (60 digits) of term #17:
538850037336692723380277063730779179448784242466222548212847
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 '121' --type 48 --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":"121"},"type":48,"part":"last20","fr":0}}'