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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.

A250404 Numbers k such that the set of all distinct values of phi of all divisors of k equals the set of all proper divisors of k+1 where phi is the Euler totient function (A000010).

Table of values

n a(n)
1 1
2 2
3 3
4 15
5 255
6 65535
7 4294967295

List of values

[1, 2, 3, 15, 255, 65535, 4294967295]

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

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