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 A230456 #12 Oct 22 2013 12:53:21 %S A230456 23,29,39,71,95,119,125,135,159,263,287,343,349,359,373,383,407,413, %T A230456 423,437,469,479,503,509,519,543,599,605,615,629,639,663,669,679,711, %U A230456 741,791,797,807,839,869,917,933,1031,1055,1111,1117,1127,1141,1151,1175 %N A230456 Odd evil a(n) (A001969), such that 3*a(n) and a(n)+3 are odious (A000069). %C A230456 Or a(n) is odd number such that the polynomial x^2 - (a(n)+3)*x + 3*a(n) has odious coefficients and evil roots. %C A230456 3*a(n) is in the A224072. %t A230456 evilQ[n_]:=EvenQ[DigitCount[n,2][[1]]]; odiousQ[n_]:=OddQ[DigitCount[n,2][[1]]]; Select[Range[3000], OddQ[#] && evilQ[#] && odiousQ[3#] && odiousQ[#+3]&] (* _Peter J. C. Moses_, Oct 19 2013 *) %Y A230456 Cf. A000069, A001969, A224072. %K A230456 nonn,base %O A230456 1,1 %A A230456 _Vladimir Shevelev_, Oct 19 2013 %E A230456 More terms from _Peter J. C. Moses_, Oct 19 2013