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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.

A139490 Numbers n such that the quadratic form x^2 + n*x*y + y^2 represents exactly the same primes as the quadratic form x^2 + m*y^2 for some m.

Table of values

n a(n)
1 1
2 4
3 6
4 7
5 8
6 10
7 14
8 16
9 18
10 22
11 26
12 38
13 58
14 82
15 86

List of values

[1, 4, 6, 7, 8, 10, 14, 16, 18, 22, 26, 38, 58, 82, 86]

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

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