[seqfan] Re: Mystery sequence

[rkg]

With a bit of adjustment, there are 4 columns,
with the numbers congruent to 1, 2, 3, 4 mod 4.  R.

On Fri, 23 Dec 2016, Neil Sloane wrote:

> A friend just sent me a photo of a T-shirt she
> saw someone wearing in Mexico City today
>
> It has the numbers
>
>      2   3
> 5        7
>          11
> 13      15 16
> 17      19
>          23
>
> on it. So far, the primes plus 15 and 16
>
> New to me. I can send the photo if anyone wants to see it.
>
> Any ideas?
>
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