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 A109019 #28 Feb 16 2025 08:32:58
%S A109019 13,15,17,26,31,37,39,49,51,58,62,71,73,79,85,93,94,97,107,113,115,
%T A109019 117,122,123,126,129,143,147,149,155,157,158,159,165,167,169,177,178,
%U A109019 179,183,185,187,199,203,205,221,225,226,244,246,265,270,285,286,289,290
%N A109019 Numbers whose digit reversal is different and has the same number of prime factors (with multiplicity).
%C A109019 _Ray Chandler_ has coauthorship credit for this sequence.
%H A109019 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AlmostPrime.html">Almost Prime</a>.
%H A109019 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Emirp.html">Emirp</a>.
%H A109019 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Emirpimes.html">Emirpimes</a>.
%F A109019 {A006567} U {A097393} U {A109023} U {A109024} U ... U {A109031} U ...
%t A109019 Select[Range@1000, ! PalindromeQ@# && Differences@PrimeOmega@{#,IntegerReverse@#} == {0} &] (* _Hans Rudolf Widmer_, Jun 03 2022 *)
%Y A109019 Cf. A006567, A097393, A109018, A109023-A109031.
%K A109019 nonn,base
%O A109019 1,1
%A A109019 _Jonathan Vos Post_, Jun 16 2005
%E A109019 More terms from _Stefan Steinerberger_, Jun 16 2007