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Count with me (Posted on 2005-05-26) Difficulty: 2 of 5
1,1,2,1,3,2,4,1,4,3,5,2,6,4,?

  Submitted by Tristan    
Rating: 4.2500 (4 votes)
Solution: (Hide)
Take the sequence 1,2,3,4,... and prime factorize every number. In the prime factorization, replace Nth prime with N. Remultiply out to get the sequence above.

For example, 15 goes in the question mark's place. 15 prime factorizes to 3*5. 3 is the 2nd prime, and 5 is the 3rd prime, so we change 3*7 to 2*3=6.

A different solution that also works is explained in a comment by Charlie

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionPuzzle SolutionK Sengupta2008-11-02 01:15:45
AnswerK Sengupta2008-10-23 00:48:43
re(2): Answer?? - To Charliepcbouhid2005-05-27 19:15:34
No Subjectarmando2005-05-27 13:38:21
re(2): Answer??Fletch2005-05-27 13:14:11
SolutionFull solutionJer2005-05-27 12:15:06
ConfusedRaika2005-05-26 22:29:23
No Subjectarmando2005-05-26 22:20:41
re(2): The next 16 termsJer2005-05-26 18:59:01
Solutionre: Answer??Charlie2005-05-26 18:41:43
re: The next 16 termspcbouhid2005-05-26 18:21:24
Answer??Raika2005-05-26 17:03:34
The next 16 termsJer2005-05-26 16:58:50
I disagree with cheating ...pcbouhid2005-05-26 16:42:55
My guessFletch2005-05-26 15:48:35
A try w/o spoilerarmando2005-05-26 14:00:16
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