Hello Math-Fun, I've drawn this, last Saturday: 2 2 4 2 2 4 6 2 4 4 2 6 8 2 6 4 4 6 2 8 10 2 8 4 6 6 4 8 2 10 12 2 10 4 8 6 6 8 4 10 2 12 14 2 12 4 10 6 8 8 6 10 4 12 2 14 16 2 14 4 12 6 10 8 8 10 6 12 4 14 2 16 18 2 16 4 14 6 12 8 10 10 8 12 6 14 4 16 2 18 20 2 18 4 16 6 14 8 12 10 10 12 8 14 6 16 4 18 2 20 ... Top line says: I see two integers "2" so far Next line says: I see four integers "2" and two integers "4" so far Next line says: I see six integers "2", four integers "4" and two integers "6" so far etc. The counts are thus cumulative. And the (easy-to-build) array infinite. Who will produce a similar array (self-describing and infinite), containing at least one odd integer? I couldn't. Best, É.