The next number is -21
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
21
The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.
The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36
The next number is -21
10
225
the answer will be 21
4
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
21
21
21.
21
No, sadly not. Percy's series has come to an end.
December 11,2011