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Fill in the ‘?’

B C E G K M Q S ?

For bonus marks, discuss if the above sequence should actually start with B or some other letter?

I hope this puzzle hasn’t been posted before

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The next one is W, and yes, the sequence should start with B.

A=1 does not conform to the “official” definition: a prime number is a whole number that has exactly two divisors: 1 and itself.

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Correct! (on both counts).

Actually, I will have to ding you a little because, by your definition of prime, -7 would also qualify – see wikipedia. Or are you using ‘whole numbers’ to mean only positive? However, see wikipedia again

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I used the colloquial definition of whole numbers, but natural numbers would have been a more accurate term.

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