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Interesting numbers (Posted on 2011-06-07) Difficulty: 3 of 5
3, __, 5, 7, 11, 13, 17, __, 29, __, 47...
What numbers go in the blanks?

See The Solution Submitted by Math Man    
Rating: 3.0000 (1 votes)

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re: Sloaneable (spoiler) Comment 3 of 3 |
(In reply to Sloaneable (spoiler) by Charlie)

Charlie,

If you make the blanks 'wildcards' i.e. do not put a comma after 3, 17,29, you should get A001605 right away.

It is necessary, although not sufficient, for the nth Fibonacci Number to be prime, if its index is prime, see Fibo Composes

Edited on June 8, 2011, 1:58 am
  Posted by broll on 2011-06-08 01:41:07

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