This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A160268 #3 Mar 30 2012 18:52:53 %S A160268 11,23,37,41,43,59,61,79,83,97,103,107,113,121,139,143,147,149,163, %T A160268 167,169,171,173,177,181,183,191,193,199,201,203,227,237,243,249,251, %U A160268 263,271,283,287,289,293,303,313,317,321,323,347,351,353,355,359,363,367,373,379 %N A160268 Odd numbers k for which A006694( (k-1)/2 )< A006694( (A000265(3k+1)-1)/2 ) . %C A160268 Conjecture: For every k in the sequence, the number k^2 is in the sequence as well. %C A160268 Composite numbers in the sequence which are not perfect squares are 143, 147, 171, 183 etc. [R. J. Mathar, May 16 2009] %Y A160268 A006694, A160198, A122458, A159885, A159945, A160266, A160267. %K A160268 nonn %O A160268 1,1 %A A160268 _Vladimir Shevelev_, May 07 2009 %E A160268 Edited and extended by _R. J. Mathar_, May 16 2009