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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.

A250405 Numbers k such that all values of Euler phi (A000010) of all divisors of k are pairwise distinct and represent all proper divisors of k+1.

Table of values

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

List of values

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

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

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