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 A119889 #3 Mar 30 2012 17:22:42 %S A119889 3,13,17,19,31,37,53,59,67,71,73,79,89,97,103,107,109,127,139,149,157, %T A119889 163,167,179,181,193,197,199,211,229,233,239,251,257,269,271,277,283, %U A119889 293,307,337,347,349,359,367,373,379,383,389,397,409,419,431,433,439 %N A119889 Prime soloist : prime number which is no member of any prime ensemble. %H A119889 L. Stevens, <a href="http://www.lucstevens.com/Primeensembles.htm">Prime ensembles</a> %e A119889 17 is in the sequence because the sum of the digits (8) is a composite number. 449 is in the sequence because the sum of the digits (17) is another prime soloist. %Y A119889 Cf. A119890, A119891, A119892. %K A119889 base,nonn %O A119889 1,1 %A A119889 Luc Stevens (lms022(AT)yahoo.com), May 27 2006 %E A119889 Corrected by _T. D. Noe_, Oct 25 2006