
Number Theory Number Theory Math Forum 
 LinkBack  Thread Tools  Display Modes 
February 15th, 2012, 09:06 AM  #1 
Newbie Joined: Feb 2012 Posts: 1 Thanks: 0  Can I give you guys a number theory related riddle?
This is the sequence, that contains 10 numbers. Find the eleventh one and the pattern. 20243134364148505457? Yes, 20 is the first number. Note: the answer is NOT trivial. I can give a hint if you want to. 
February 15th, 2012, 06:44 PM  #2 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: Can I give you guys a number theory related riddle?
Here's my 'theory' look at the differences between consecutive terms 4 7 3 2 5 7 2 4 3 each difference appears twice EXCEPT 5 so the next difference must be 5 making the next number of your sequence 57 + 5 = 62 
February 15th, 2012, 07:14 PM  #3 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Can I give you guys a number theory related riddle?
I cheated and found the sequence on OEIS, and I don't feel bad for having cheated because I would never have figured it out on my own! 
February 15th, 2012, 07:15 PM  #4 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: Can I give you guys a number theory related riddle?
so what is the answer Mark? oh, 69... 
February 15th, 2012, 07:28 PM  #5 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Can I give you guys a number theory related riddle?
Yes, 69 is the next number in the sequence. 
February 15th, 2012, 11:50 PM  #6 
Senior Member Joined: Jan 2007 From: India Posts: 161 Thanks: 0  Re: Can I give you guys a number theory related riddle?
Please post the logic as well please .

February 16th, 2012, 03:07 PM  #7 
Newbie Joined: Oct 2011 Posts: 24 Thanks: 1  Re: Can I give you guys a number theory related riddle?
You can find the logic in oeis.org website... "Numbers n such that 6*n1 and 6*n+1 are twin composite odd numbers." Anyway here i have my own sequence, find the next term: 1113138124511092138221??????? 
February 16th, 2012, 06:47 PM  #8 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: Can I give you guys a number theory related riddle?
[edit].....112561...[endedit] but no help from oeis i can explain if anyone asks... here's a sequence i solved on another forum, not on file at oeis 1,2,3,4,5,8,7,16,9,... find the next term and the general rule 
February 16th, 2012, 07:05 PM  #9 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Can I give you guys a number theory related riddle?
The nth term is as follows: For odd n: For even n: So, the next or 10th term is 
February 16th, 2012, 07:16 PM  #10 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: Can I give you guys a number theory related riddle?
very good, can you get the one given by THEBROKER...?


Tags 
give, guys, number, related, riddle, theory 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Finding all postive integer p which give a quadratic number  zerostalk  Algebra  3  January 10th, 2012 03:59 PM 
Graph Theory  bipartite related proof  cxc001  Applied Math  1  September 15th, 2010 11:55 AM 
functionrelated problems in set theory  spellbinder  Applied Math  1  August 15th, 2010 01:07 PM 
Number Riddle in Need of Solving  solarplexus7  Number Theory  1  October 21st, 2009 09:52 PM 
Graph Theory  bipartite related proof  cxc001  Number Theory  0  December 31st, 1969 04:00 PM 