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.

A260144 Numbers k such that there exist two numbers a and b where k = a.b = sigma(a)*phi(b) ("." means concatenation).

Table of values

n a(n)
1 1568
2 14049280
3 140492800
4 368089904
5 506300928
6 1404928000
7 14049280000
8 124856008704
9 140492800000
10 1404928000000

List of values

[1568, 14049280, 140492800, 368089904, 506300928, 1404928000, 14049280000, 124856008704, 140492800000, 1404928000000]

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

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