factordbrpc · fdb
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Inverse home prime · Base 18 of 1887 length 23 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
3 Fully factored 7 1593849 3×37×83×173
4 Fully factored 9 327379989 3×3163×34501
5 Fully factored 10 3621833913<10> 3×1207277971<10>
6 Fully factored 11 21731003481<11> 3×11×658515257
7 Fully factored 12 213358943469<12> 3×7×23×73×1973×3067
8 Fully factored 15 6084350573…37<15> 3×61×9203×361271513
9 Fully factored 18 2211776573…13<18> 3×97×7600606780…43<15>
10 Fully factored 19 4432673874…25<19> 3×52×7×151×5591515451…03<14>
11 Fully factored 22 1901798760…85<22> 3×5×43×11527×2557929391…79<15>
12 Fully factored 25 2818828105…81<25> 3×211×1023991×4540219×957837733
13 Fully factored 27 3590103863…49<27> 3×11×1087910261…53<26>
14 Fully factored 28 3524829247…73<28> 3×89×215123×6136771832…53<20>
15 Fully factored 30 6762698366…69<30> 3×78463793×2872959237…11<22>
16 Fully factored 32 3165989752…13<32> 3×13×347×29611×5205839×1517649964…09<17>
17 Fully factored 36 1023903889…53<36> 3×2027×1683775512…13<32>
18 Fully factored 37 1767560182…77<37> 3×37×151×157×191×3516748119…11<28>
19 Fully factored 39 6975796614…37<39> 3×53×2048342046…73<13>×2141875414…91<25>
20 Fully factored 41 4460019649…81<41> 3×72×15583×1947010827…81<35>
21 Fully factored 44 1191999031…45<44> 3×5×911×121631×2478743×2893280155…21<28>
22 Composite 48 3513585853…93<48> 3×773×16130608997<11>×9392886124…51<34>
↳ Open Open - the last known term is composite and not yet fully factored.
Open end - submit a factor of the remaining composite (34 digits) of term #22:
9392886124502716645953348906470251
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 '1887' --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":"1887"},"type":68,"part":"last20","fr":0}}'