What is the missing number in this series
1,16,36,__,81,100,144
See Solution
Series is the square of non prime numbers, 12, 42, 62, 82, 92, 102, 122. these are square in sequence excluding the prime numbers 2,3,5,7 and 11. Thus the missing number in series should be 82=64.
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64
guess i dont mind half a year ago? (49)
What you thought 6 months ago was correct :), This series is square of non prime numbers, See Solution above(link to expand solution), correct answer is 64.