M4maths Previous Puzzles

02 Jan 2017 Sequence

What is the next number of the following sequence
2, 6, 15, 28, 55, ?

OPtion

1) 63
2) 78
3) 66
4) 72
5) 84
6) 98
7) 104
8) 106
9) 108
10)110

Solution

Series is formed by Multiplying Prime number with its position in prime number list
1*2 = 2
2*3 =6
3*5 = 15
4*7 = 28
5*11 = 55
6*13 = 78

Option 2)

Correct Option: 2 Best Solution (0)