Sol

 513/15 = 34.2

Hence LCM value should be more than 34

Let’s take it 35

35*14 = 490, so 15^th number should be 23. But LCM of 35 and 23 is not 35.

Now let’s take it 36

36*14 = 504, so 15^th number should be 9. And LCM of 36 and 9 is still 36.

Hence correct answer is 36