Numbers

[halftimeorange]

7,11,15,13

[dannyk13]

Not enough information.

[Mamyalynne]

They are yes, is there a question for us?

[bobbinwales]

All are odd

[bobbinwales]

Next two could be 23 and 15

[bobbinwales]

another solution for next 2 is -1, -33

[elliemay1]

I agree with 23, 15

[dannyk13]

Could also be 22 & 24

[bobbinwales]

Maybe thats not the question

[bobbinwales]

Can u give us anymore info on what we'er looking for halftimeorange??

[Calibax]

15 is not a prime number?

[bobbinwales]

Well yes, if its odd one out thats needed, but it seems odd (no pun) to put 15 before 13 in the list. Could of gone 11,13,15,17 if they wanted the odd one out.
Anyway if its odd one out could be 13- all the rest are 1 less than a number in the 4 times table, or 7 because all the other's have 2 digits...

[elliemay1]

I suspect we'll never know!

[halftimeorange]

It's a mathematical sequence.

[bobbinwales]

SO you want to know whats next. We've suggested a few possible answer's that are all just as good as each other iMO. There will be others such as 11 next which can be explained by +4 +4 -2 -2

[Etch]

I reckon it's 17: 'seven' has 5 letters, 'eleven' has 6 letters, 'fifteen' has 7 letters, 'thirteen' has 8 letters, and 'seventeen' has 9 letters.

[bobbinwales]

Maybe . Good lateral thinking but if so they could have chose other numbers like 8 not 7

[Etch]

Yes, they could have, but they didn't. The blog that gave me the idea used 19 rather than 13 for the fourth number: both are 8 letters long:
https://richardwiseman.wordpress.com/2011/08/22/answer-to-the-friday-puzzle-118/
:-)

[bobbinwales]

Agree yours looks best. For us to get just a single correct sequence Wednesday another entry in the list as just 4 gives so many option's

[bobbinwales]

' We need' not Wendesday

[bobbinwales]

//I reckon it's 17: 'seven' has 5 letters, 'eleven' has 6 letters, 'fifteen' has 7 letters, 'thirteen' has 8 letters, and 'seventeen' has 9 letters.// Given that a similar solution as been given in a previous puzzle its probably what the setter wants.
But,,, seventeen is not the only number with 9 letters. It could be 24 (twentyfour) or 25 or 29 or 31 or 32 or....

I think it work's tho if you say its the smallest number that fit's the pattern