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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.

A066780 a(n) = Product_{k=1..n} sigma(k); sigma(k) is the sum of the positive divisors of n.

Table of values

n a(n)
1 1
2 3
3 12
4 84
5 504
6 6048
7 48384
8 725760
9 9434880
10 169827840
11 2037934080
12 57062154240
13 798870159360
14 19172883824640
15 460149211791360
16 14264625565532160
17 256763260179578880
18 10013767147003576320
19 200275342940071526400
20 8411564403483004108800

List of values

[1, 3, 12, 84, 504, 6048, 48384, 725760, 9434880, 169827840, 2037934080, 57062154240, 798870159360, 19172883824640, 460149211791360, 14264625565532160, 256763260179578880, 10013767147003576320, 200275342940071526400, 8411564403483004108800]

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

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