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Difficult Sequence (Posted on 2003-10-18) Difficulty: 5 of 5
What is the next number in the sequence? 21,45,66,102,115,171,?

See The Solution Submitted by Freddy Grants    
Rating: 3.6667 (9 votes)

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Hint | Comment 15 of 19 |
I admit, this problem is very difficult, hence difficult sequence. I dont know if this is much of a hint, but it will lead you in the right direction, it does not have anything to do with roman numerals, chemistry tables, or words in an elementary essay, you can figure this out without any research. The numbers have no more meaning then the number itself, they represent nothing but part of a formula.
  Posted by Freddy Grants on 2003-10-25 10:13:03
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