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The Great (Posted on 2013-09-06) Difficulty: 3 of 5
If the members of the set :
S={2x3y : x>=0,y>=0}
are arranged in increasing order we get the sequence beginning
1,2,3,4,6,8,9,12,16,18,......
(a)What is the position of 2a3b in the sequence in terms of a and b.
(b)What is the n-th term of the sequence in terms of n.

No Solution Yet Submitted by Danish Ahmed Khan    
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Some Thoughts Where to find the sequence | Comment 1 of 2
The sequence, with discussion, can be found at A003586 in Sloane's OEIS.
  Posted by Charlie on 2013-09-09 09:47:10
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