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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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This one was tuff !! | Comment 5 of 19 |
A "DIFFICULT" sequence... DIFFICULT = DIICL + FFUT. FFUT is the reverse spelling of TUFF, a common slang spelling of TOUGH, a synonym for DIFFICULT. If you remove TUFF from DIFFICULT, the sequence becomes much less tuff. DIFFICULT minus TUFF leaves Roman Numerals DIICL. (D=500, C=100, L=50, I=1). DIICL = DCLII= 652 = 21 + 45 + 66 + 102 + 115 + 171 + 132. So the next number in the sequence is 132. (Lame ? Yes, but I managed to find Silver Knight's essay after rummaging through my papers last night, and his third paragraph actually contains 67 words, not 66. So mine is the only "valid" solution so far.)
  Posted by Dan on 2003-10-21 10:15:42
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