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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A126147 a(n) = floor((Product_{k=1..n-1} prime(k))/prime(n)).

Table of values

n a(n)
1 0
2 0
3 1
4 4
5 19
6 177
7 1766
8 26868
9 421725
10 7692857
11 208699781
12 5420553787
13 180993613044
14 7075587523888
15 278356624078085
16 11601694011103611
17 552358618257458385
18 31520661477937912115
19 1750572856110551805720

List of values

[0, 0, 1, 4, 19, 177, 1766, 26868, 421725, 7692857, 208699781, 5420553787, 180993613044, 7075587523888, 278356624078085, 11601694011103611, 552358618257458385, 31520661477937912115, 1750572856110551805720]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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