You could make a case for any of them.
If the series is plus one, times two, plus one, times two, etc., the 8 does not belong.
It could be any one of them: 3: A 1-digit perfect square - 1 which is not a perfect cube. 7: A perfect cube - 1 8: A 1-digit perfect square - 1 which is also a perfect cube. 15: A perfect 4th power - 1 30: More than 1 away from a perfect power.
randomly
You find the first 20 prime numbers and add them together. There is no formula for generating a sequence of prime numbers and so none for the series of their sums.You find the first 20 prime numbers and add them together. There is no formula for generating a sequence of prime numbers and so none for the series of their sums.You find the first 20 prime numbers and add them together. There is no formula for generating a sequence of prime numbers and so none for the series of their sums.You find the first 20 prime numbers and add them together. There is no formula for generating a sequence of prime numbers and so none for the series of their sums.
The numbers that belong to the series are the following: 1, 2, 5, 10, 13, 26, 29 and 48.
30
You could make a case for any of them.
8
9 - all the rest are prime
The answer is 12 every other numbers are odd numbers, but 12 is an even number
Most probably 48.
133 ,because all haveroot squares except 133
1 - it is the only number that is neither prime nor composite.
if i did mental math correctly..i believe it's 4845... because the rest are prime numbers
D
64, since its reverse, 46, is not in the series.