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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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re: AARRGG.. | Comment 2 of 19 |
(In reply to AARRGG.. by Paul)

You're not alone. I also tried consucutive differences, other bases, etc and have gotten nowhere. This sequence even stumped the Sloane Integer Encyclopedia.
  Posted by Brian Smith on 2003-10-20 15:21:35

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