27
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The next number in the sequence is 27. To get the next number, double the number and add one. Except for the second number, all the numbers in the sequence follow this rule.
25
The number which best completes the sequence below is:1 1 3 2 4 6 5 25 ?
25 is the next number that appears in that sequence.
This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.