
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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August 2nd, 2017, 01:23 AM  #1 
Senior Member Joined: Oct 2013 From: Far far away Posts: 422 Thanks: 18  I'd like some help
What is special/peculiar about the set {1, 2, 9, 10}? It seems we can construct ALL possible positive integers from it but that's easy because we have 1. Anything peculiar about this set? I'd be very grateful if you could tell me. Thanks 
August 2nd, 2017, 07:54 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 10,706 Thanks: 703 
They could be the first 4 terms of an integer sequence dictated by a(n) = n + 6[floor(n/3)] 
August 2nd, 2017, 09:37 AM  #3 
Senior Member Joined: May 2016 From: USA Posts: 805 Thanks: 320  I don't understand the question. We can construct all possible positive integers from the set {1}.

August 7th, 2017, 04:04 AM  #4 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,741 Thanks: 710 
Please give us some context. What makes you think that there is anything "special" or "peculiar" about this set?
