[seqfan] Re: Question from Harvey Dale about A233552

[neil greubel]

The solution to the question of additional conditions applied would also
help in sequences A233551 <https://oeis.org/A233551>,  A251057
<https://oeis.org/A251057>, and  A251757 <https://oeis.org/A251757>.

On Sun, May 26, 2019 at 1:31 PM Neil Sloane <njasloane at gmail.com> wrote:

> Harvey just asked me the following question.  Can anyone help?
>
>
> I may be missing something, but there seem to be many terms missing from
> the above sequence. My calculations show that, up to 1000, each of 25, 49,
> 121, 169, 289, 361, 373, 499, 529, 613, 625, 751, 841, 919, and 961
> satisfies the definition, but only 361 and 919 appear in the data. Am I
> overlooking something? Also, I’m not sure how to test “all k >=1” because
> that would require going up to infinity — so, is there some top limit to
> the value of k that should be tested, e.g., k<=n? Or is there some other
> way to do the test that doesn’t require generating lots of terms?
>
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