Guest Posted April 4, 2008 Report Share Posted April 4, 2008 What is special about 13731? If you must, think sequences and formulas Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 4, 2008 Report Share Posted April 4, 2008 (edited) What is special about 13731? If you must, think sequences and formulas Can you be a little more specific about what you want? There are many answers for this one. It is a palindrome, it is the only number between 13730 and 13732. All the digits that make up the number are prime numbers... etc. Could you please help us out? Edited April 4, 2008 by Noct Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 4, 2008 Report Share Posted April 4, 2008 Can you be a little more specific about what you want? There are many answers for this one. It is a palindrome, it is the only number between 13730 and 13732. All the digits that make up the number are prime numbers... etc. Could you please help us out? I am thinking of a formula that creates this palidrome (its repeating) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 4, 2008 Report Share Posted April 4, 2008 palindromic prime base 9 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 4, 2008 Report Share Posted April 4, 2008 palindromic prime base 9 Not what I was thinking, part of the previous hint is this is constantly repeating. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 5, 2008 Report Share Posted April 5, 2008 (edited) Not what I was thinking, part of the previous hint is this is constantly repeating. f(x)' = 2x + 1+c Edited April 5, 2008 by PolishNorbi Quote Link to comment Share on other sites More sharing options...
0 Guest Posted April 7, 2008 Report Share Posted April 7, 2008 f(x)' = 2x + 1+c If you take f(x) = x^2 + x + 1, all the right digits will follow the sequence 13731, ie; 0 = 1 1 = 3 2 = 7 3 = 13 (3 on the right) 4 = 21 (1 on the right) Quote Link to comment Share on other sites More sharing options...
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What is special about 13731?
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