Question

Find the missing number in the series.2,4,7,10,15,18,....

Answer 1

Answer:

This is a very interesting question which i I loved solving. Unlike most of the other puzzles this does not have a straight forward simple formula.

This sequence follows this simple logic:

Prime(n)+n-1

Here Prime(n) is the nth prime of the prime numbers.

So if n=1 then: Prime(1)+1-1 = 2+1-1 = 2

n=2 then: Prime(2)+2-1 = 3+2-1 = 4

n=3 then: Prime(3)+3-1 = 5+3-1 = 7 and so on...

The next number in the series should be:

Prime(8)+8-1 = 19+8-1 = 26

The next number in the series is 26.

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