[seqfan] Re: integers that are either square or thrice a square, where do such beasts hide?

[Allan Wechsler]

There is a near-hit at A230781. The first difference is that your sequence
contains 49.

In general, A230781 excludes from your sequence numbers of the form x^2 +
xy + y^2, for 0 < x < y; that is, numbers in A024606.

If this really arises naturally, it seems worth submitting.

On Wed, Aug 29, 2018 at 11:02 AM Wouter Meeussen <wouter.meeussen at telenet.be>
wrote:

> do they occur anywhere naturally? in combinatorics or in number theory?
> I bumped into them by accident looking at bracelet-stuff.
>
> Wouter.
>
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