Why Is 13 The Odd One Out

[major4577]

13, 21, 25 why is 13 the odd one out in today’s Daily Mail

[Spicerack]

It starts with a 1
Oh, and can't be divided.

[NickorWan]

Prime?

[JJ109]

Or it isn't next to the number 2 on a roulette wheel (21 and 25 are)
or a lot of other reasons

[weecalf]

Acause it’s figures add up to an even number the others don’t

[Spicerack]

^ That sounds good. That wasted youth came in handy after all, jj.

[fiction-factory]

1x3 gives an odd number whereas 2x1 and 2 x 5 given even numbers
13 is the only prime?
13 is the only one of the three numbers that appears on a dartboard
It's the only one that's 4 ,ore and 3 less than a square number.
Far too many possible reasons.
Was this the full list/question? Was there anything there to connect it to roulette?

[teacher1]

It should be .... 13,19,21,25. Which is the odd one out? Clue .. Adele

[ToraToraTora]

so clearly 13 is not an Adele album!