4-7 __7-13__ 13-25 __25-39 __39-78
+3 ___+6___ _+12____+24____+39
___+3 ___+6____ +12 ____+24
_____+3____ +6 _____+12
________+3_____ +6
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25 is the next number that appears in that sequence.
13 18 16 21 19 24 22 27 25 ... . This series consists of adding 5 to the first number and subtracting 2 from the next number, repeating the sequence in that order.
Each is half of the previous number, so 6.25 will be next.
This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.
the next number in the sequence 1 5 25 125 is 625