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https://en.wikipedia.org/wiki/Four_color_theorem

https://en.wikipedia.org/wiki/Four_color_theorem

I ended up doing it in 4 colours, I didn't have the mental or physical energy left after getting the grid filled to see whether it could be done in 3......in a perverse sort of way I quite enjoyed this, took me back to O-level maths.!

Scroll down at this website to see the nets with the dice spots on them.
https://mathigon.org/task/nets-of-a-cube

Forgot to say that one thing I learned doing this is that the products of three different primes are called sphenic numbers.

I tried the nets today, couldn't fit the 11th. One net is just 2 columns wide. Does that go in the NE or SW corner? Does the T go on its side at the top? Please

I don't have my grid to hand but as I recall, the 2column net goes NE and the T does indeed go side on at the top

Thanks Muraria

Noooo! So near yet so far... I have clearly gone wrong as the last digit I thought I needed to enter is the unchecked cell in 1ac... but it doesn't give a prime :(

back to the drawing board and a lot of checking to redo...

haha, seems i just can't check prime numbers properly - must have been fat fingers somewhere! phew! I can start grid-searching now...