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S_pugh, It wasn't a typo.

Reynard,
2 & 20 are correct. The third can be identified by looking at all possible grid numbers that satisfy the property o. One of those numbers does not appear anywhere else if you have listed everything, ie, it cannot be anything but o.

Reynard, the other grid entry for type 'o' is either 14 or 35. Type 'm' is the converse, together with 34 and 38.

Oh dang. I had 10a as a tetrahedral (h) and had what I thought was a working answer as it seemed to tally with everything else.

S_pugh, it is a tetrahedral number. The middle term referred to is 'n + 1'.

Ah! Thanks Dryden, panic over - I just plugged the equation into XL so didn't worry about the individual terms - that tallies with my answer. Cheers for the clarification.

Thank you both. Slow progress still being made.

Meursault

I am glad you have joined this discussion as it gives me the chance to thank you and Norah for helping me to post on the forum, having been a lurker for a long time and benefited from your observations. It seems that the secret is to avoid single quotes and apostrophes. Luckily I am not a grocer!

Could someone confirm whether 23d is 789? I'm having trouble with that last section of the grid.

Thanks.

Hi Demeter, I was just looking at that very same spot. I see only 2 possible properties for 23A and 23D, that is properties 'i' & 'p'. My 9D is 80089 or 80656. Either way, 23A cannot be the prime number. So, 23D is the prime number...but 789 is div by 3