Search: id:A050683
Results 1-1 of 1 results found.

%I A050683
%S A050683 9,9,90,90,900,900,9000,9000,90000,90000,900000,900000,9000000,9000000,
%T A050683 90000000,90000000,900000000,900000000,9000000000,9000000000,
%U A050683 90000000000,90000000000,900000000000,900000000000,9000000000000
%N A050683 Number of palindromes of length n.
%C A050683 In general the number of base k palindromes with n digits is (k-1)*k^floor[(n-1)/
               2].
%C A050683 This sequence does not count 0 as palindrome with 1 digit, see A070252=(10,
               9,90,90...) for the variant which does. [From M. F. Hasler (MHasler(AT)univ-ag.fr), 
               Nov 16 2008]
%H A050683 Dr. Math, <a href="http://mathforum.org/dr.math/problems/stang4.8.14.97.html">
               More info 1.</a>
%H A050683 Dr. Math, <a href="http://mathforum.org/dr.math/problems/akyildiz1.4.98.html">
               More info 2.</a>
%F A050683 a(n) = 9*10^floor[(n-1)/2]
%o A050683 (PARI) A050683(n)=9*10^((n-1)\2) [From M. F. Hasler (MHasler(AT)univ-ag.fr), 
               Nov 16 2008]
%Y A050683 Cf. A002113, A050250, A050251, A070252, A070199. Cf. A016116 for numbers 
               of binary palindromes, A016115 for prime palindromes.
%Y A050683 Sequence in context: A112296 A038299 A165427 this_sequence A092548 A121389 
               A065242
%Y A050683 Adjacent sequences: A050680 A050681 A050682 this_sequence A050684 A050685 
               A050686
%K A050683 nonn,easy,base,nice
%O A050683 1,1
%A A050683 Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
%E A050683 Additional comments from Henry Bottomley (se16(AT)btinternet.com), Aug 
               14 2000

Search completed in 0.002 seconds