Prime Sequence

Logic Level 2

Which number can replace the question mark in the above sequence?

23 , 21 , 24 , 19 , 26 , 15 , 28 , 11 , 30 , 7 , 36 , ? 23, 21, 24, 19, 26, 15, 28, 11, 30, 7, 36, ?

Hint: the title.


The answer is 5.

Abdeslem Smahi by Abdeslem Smahi , 24, Algeria

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2 solutions

Alex Li
Jul 7, 2015

The pattern is − 2 , + 3 , − 5 , + 7 , − 11 , + 13 , . . . -2, +3, -5, +7, -11, +13, ...

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Chitty Gadiparthi
Jul 28, 2015

There is always a difference of two between the difference of the two numbers and the difference of the two numbers after them

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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