Now, your problem is a bit sneaky because you don't have a very long string of numbers before a hole appears in the sequence, but you have a sequence of gaps that looks like: 7, 19, ?, ?, 91. read more
The missing number in the sequence is 64, which goes between 27 and 125. The number sequence is of cubed numbers: 1 is 1 cubed, 8 is the number 2 cubed, 27 is the number 3 cubed and 64 is the number 4 cubed. read more
So missing number is cube of 4 i.e. 4^3 = 64 It can also be explained as given below 64 – the series is a list of the cube of the first 6 positive integers – 1^3 = 1, 2^3 = 8, 3^3 = 27, etc. read more