# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a238304 Showing 1-1 of 1 %I A238304 #7 Feb 24 2014 10:27:18 %S A238304 0,0,0,0,0,1,0,0,1,0,0,1,1,0,1,0,1,1,0,1,1,1,0,2,0,0,2,1,0,1,1,2,1,0, %T A238304 0,2,1,1,2,1,0,2,0,2,2,0,1,1,1,1,1,3,0,2,0,1,2,1,1,4,1,1,1,1,0,2,2,2, %U A238304 2,0,1,3,1,0,1,3,1,2,0,2,2,2,1,4,1,0,3,1,0,1,0,5,2,3,1,2,2,0,2,1,1,3,1,2,2,1,2,5 %N A238304 Number of monic quartic polynomials with coefficients from {1..n} and maximum coefficient equal to n, for which all four roots are integers. %C A238304 Among first 10000 terms the largest is a(8640) = 174. %C A238304 Also a(n) = 0 for n = 1,2,3,4,5,7,8,10,11,14,16,19,23,25,26,29,34,35,41,43,46,53,55,65,70,74,79,86,.. (329 terms among first 10000 terms.) %H A238304 Zak Seidov, Table of n, a(n) for n = 1..10000 %Y A238304 Cf. A238097. %K A238304 nonn %O A238304 1,24 %A A238304 _Zak Seidov_, Feb 24 2014 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE