[seqfan] Mystery sequence

Neil Sloane njasloane at gmail.com
Fri Dec 23 17:42:29 CET 2016

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
13      15 16
17      19

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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