it's +1 +5 +6 +7 +8, so my guess would be 37.
It is 37
37
37
37
37
http://wiki.answers.com/Q/27132028_what_comes_nextmes next? 2 7 13 20 28 ..... 2+(5)=7+(6)=13+(7)=20+(8)=28+(9)=37 therefore next number is 37
37, this sequence counts up from 5 the difference between 2 and 7. the difference between 20 and 28 is 8 making the next number 9, and 28 and 9 = 37.
37, it is 4+1 from the first number and 4+2 from the second number then 4+3 from third so on....
Oh, dude, it's like a math puzzle, but don't worry, I got you. So, if you look closely, the numbers are increasing by 5, 6, 7, 8... so the next number would be 28 + 9, which is 37. Voilà!
37. The difference between two consecutive numbers goes on increasing. 7-2=5; 13-7=6; 20-13=7; 28-20=8; 37-28=9...and so on.
20
20