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.

A081397 a(n) = least k such that GCD of sigma(k) = A000203(k) and phi(k) = A000010(k) equals n-th primorial = A002110(n).

Table of values

n a(n)
1 3
2 14
3 488
4 16072
5 284229
6 29221621
7 25014312576

List of values

[3, 14, 488, 16072, 284229, 29221621, 25014312576]

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

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