Cryptic crossword clue
Two, three, …? There will be many more in this maths set! 5,7

The most common and most likely answer to this crossword clue is the 5 plus 7 letter word PRIME NUMBERS

I've seen this crossword clue in The Daily Telegraph
P
R
I
M
E
N
U
M
B
E
R
S

Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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