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June 19th, 2015, 03:32 PM  #1 
Newbie Joined: Jun 2015 From: San jose Posts: 1 Thanks: 0  Sequence of numbers
What number is next in the sequence? 11, 13, 22, 26, 41, 68....
Last edited by skipjack; June 19th, 2015 at 07:10 PM. 
June 19th, 2015, 04:05 PM  #2 
Member Joined: Jun 2015 From: Casablanca Posts: 47 Thanks: 3 
70

June 19th, 2015, 04:06 PM  #3 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
50, if you assume it's a fifthdegree polynomial.

June 20th, 2015, 03:14 AM  #4 
Newbie Joined: May 2015 From: Doha Posts: 3 Thanks: 0 
76 Assume as follows. difference as 2 , 9, 4 , 15 (2+9+4) , 27 , 8 
June 20th, 2015, 05:25 AM  #5 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
The point is that, given any finite number of terms of a sequence, there exist an infinite number of "formulas" that will give exactly those terms and then any number you like as the next. Typically, problems like this intend the "simplest" such formula but there is no objective criterion for "simplest".


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