cp's OEIS Frontend

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.

A066986 Integers of the form (Product_{i=1..k} sigma(i))/(Product_{i=1..k} phi(i)) = A066780(k)/A001088(k).

Table of values

n a(n)
1 1
2 3
3 6
4 21
5 189
6 252
7 945
8 361179
9 1083537

List of values

[1, 3, 6, 21, 189, 252, 945, 361179, 1083537]

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

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