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Fill in (Posted on 2014-09-24) Difficulty: 2 of 5
2, 3, 5, 7, 2, 4, 8, 10, ?, 11...

What number should replace the "?" ?

See The Solution Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)

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Solution re(2): Not sure why you would do this... (Probable intended solution.) | Comment 5 of 6 |
(In reply to re: Not sure why you would do this... by Ady TZIDON)

The numbers are just the sum of digits of the primes.
1+1=2
1+3=4
1+7=8
1+9=10
2+3=5
2+9=11

My first solution is equivalent but more complicated:  each prime minus 9 times its tens digit.  Although I made the error of considering 27 prime instead of 29.


  Posted by Jer on 2014-09-25 09:50:59

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