257, 178, 259, 173, 261, 168, 263, 163, ?, ?

Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

 

Fun:	(2.17)
Difficulty:	(2.1)
Category:	Series
Submitted By:	Victor

 

What are the next two numbers in this series?

257, 178, 259, 173, 261, 168, 263, 163, ?, ?

Answer

265, 158.

Odd-positioned (first, third, fifth, seventh, ninth...) numbers increase by 2, while even-positioned (second, fourth, sixth, eighth, tenth...) numbers decrease by 5.
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