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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.

A268281 Numbers n such that n-tau(n), phi(n) and n form a Heronian triangle, where tau=A000005 is the number of divisors and phi=A000010 the totient.

Table of values

n a(n)
1 5
2 34
3 53
4 90
5 120
6 440
7 780
8 1954
9 120994
10 140453
11 28813276834

List of values

[5, 34, 53, 90, 120, 440, 780, 1954, 120994, 140453, 28813276834]

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

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