Question

What is the missing series number 1,2,2,9,3,28,4,?

Answer 1

The answer is 57.

1,2(1st prime no.), 2, 9(2nd and 3rd prime no. miss and 4th prime no. added i.e. 2+7=9),3,28(5th and 6th prime no. miss and 7th prime no. added i.e. 9+17=28),4,59(8th and 9th prime no. miss and 10th prime no. added i.e. 28+29=57)

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