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find the next number in the series

Myke Enriq
Ranch Hand

Joined: Feb 13, 2012
Posts: 102
Which one of the numbers in the series is wrong, and should be replaced?
2 - 4 - 8 - 16 - 20 - 22 - 44 - 46
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18110
    
    8

20.

It should be 32.

The sequence is 2^n mod 42.
fred rosenberger
lowercase baba
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Joined: Oct 02, 2003
Posts: 10906
    
  12

Paul Clapham wrote:20.

It should be 32.

The sequence is 2^n mod 42.

Then how can 46 be valid?


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18110
    
    8

Umm... good question. 46 is still congruent to 256 mod 42, though.
Seetharaman Venkatasamy
Ranch Hand

Joined: Jan 28, 2008
Posts: 5575

past 4 hours I am thinking of this... no luck till now... let me try further ;)
Matthew Brown
Bartender

Joined: Apr 06, 2010
Posts: 4240
    
    7

Change to 16 to 10. I'll leave the justification for now, but it's not a very complicated sequence.
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18110
    
    8

Oh yeah, it's A099942. Pity, I was kind of attached to my "42" idea.
Seetharaman Venkatasamy
Ranch Hand

Joined: Jan 28, 2008
Posts: 5575

Matthew Brown wrote:Change to 16 to 10.

Hmm then I can tell the solution...
+2 next *2 => then next element is 92...
 
I agree. Here's the link: http://aspose.com/file-tools
 
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