[seqfan] Re: A075346

Reinhard Zumkeller reinhard.zumkeller at gmail.com
Sat Sep 26 14:59:13 CEST 2015


see also tabl https://oeis.org/A075348
where the definition should also be clarified

2015-09-26 7:38 GMT+02:00 Frank Adams-Watters <franktaw at netscape.net>:

> This sequence,
>
> https://oeis.org/A075345
>
> "Group the natural numbers such that the n-th group contains n terms and
> the group sum is the smallest possible prime: (2), (1, 4), (3, 5, 9), (6,
> 7, 8, 10), (11, 12, 13, 14, 17), (15, 16, 18, 19, 20, 21), ... Sequence
> gives group sums."
>
> is not uniquely defined. For example, the third group could be 3, 6, 8
> instead of 3, 5, 9. It looks to me like it is taking the first n-1 unused
> terms, and then adjusting the next term to get the smallest available prime.
>
> Franklin T. Adams-Watters
>
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