The next number could be 25.
+3, +6, +9, +12 etc.
The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.
-2
18 b/c the pattern is +1,+2,+3...
16.
The rule of this pattern is -2 + 6 +4 so the next number would be 16.
2, the pattern is -5 then plus 2 repeated, therefore 7 - 5 = 2
22
1 2 3 4 .12 & .13 & .15 & .18 & .22
The pattern is add 2, add 4, add 6, add 2, add 4, add 6 and so forth. Based on this pattern the next number is 39.
I think that the next number in this pattern is twelve. I think that the pattern is 1/2, 2/3. 3/4, 4/5 and so on.
1440.
To get the next term, triple the present term and add 1 . The next term after 40 is 121 .