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Pick a letter (Posted on 2014-09-18) Difficulty: 3 of 5
27 - J
64 - M
125 - ?
216 - A
343 - D

What letter should replace the "?"
Why?

See The Solution Submitted by Ady TZIDON    
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Some Thoughts possible solution | Comment 2 of 4 |

The first column comprises consecutive cubes starting with 3. The second looks like months of the year, starting with January, then March (or May), then ? then August and December. Since the first two entries are not represented by cubes, the sequence would look like, say, 0,0,1,3,5,8,12: A000212 in Sloane.

The function n^3 => Floor(n^2/3) produces the result that the missing letter is M.        

Edited on September 19, 2014, 12:25 am
  Posted by broll on 2014-09-19 00:23:13

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