31, 40
1st, 3rd, etc go up by 4, others by 9
40
24
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
What would be the next number in this series 15 12 13 10 11 8?
59 is the next number in this series.
24 for each number you add 5 and then subtract 2. 19 plus 5 is 24.
24
24
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
7
What would be the next number in this series 15 12 13 10 11 8?
59 is the next number in this series.
The next number in the series is 67.
24 for each number you add 5 and then subtract 2. 19 plus 5 is 24.
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.
The rule is: add 5, subtract 2, add 5, subtract 2, . . . Next number is 24.
This is a list of prime numbers, the next ones are 17, 19, 23, 29
53