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 A075814 #9 Sep 05 2017 16:56:58 %S A075814 99,171,333,343,363,555,575,595,747,777,909,969,1001,1221,1331,1551, %T A075814 1771,3333,3553,5335,5555,5665,5885,5995,7337,7557,7667,7777,7887, %U A075814 9339,9559,9669,9779,9889,11211,11511,11711,11811,12121,12221,12621,12921 %N A075814 Palindromic odd numbers with exactly 3 prime factors (counted with multiplicity). %H A075814 Harvey P. Dale, <a href="/A075814/b075814.txt">Table of n, a(n) for n = 1..1000</a> %e A075814 99=3^2*11, 171=3^2*19 and 333=3^2*37 are palindromic, odd and have exactly 3 prime factors. %p A075814 test := proc(n) local d; d := convert(n,base,10); return ListTools[Reverse](d)=d and numtheory[bigomega](n)=3; end; a := []; for n from 1 to 13000 by 2 do if test(n) then a := [op(a),n]; end; od; a; %t A075814 Select[Range[1,13001,2],PalindromeQ[#]&&PrimeOmega[#]==3&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Sep 05 2017 *)075814:" %Y A075814 Cf. A046316. %K A075814 nonn,base %O A075814 1,1 %A A075814 _Jani Melik_, Oct 13 2002 %E A075814 Edited by _Dean Hickerson_, Oct 21 2002