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 A046404 #15 Aug 14 2024 13:12:11
%S A046404 15,21,33,35,55,77,303,393,453,505,543,573,655,707,755,905,917,939,
%T A046404 955,1057,1059,1111,1119,1149,1267,1337,1441,1565,1661,1765,1865,1915,
%U A046404 1991,2101,2181,2191,2271,2361,2391,2471,2611,2681,2757,2787,3443,3635,3785
%N A046404 Odd numbers with exactly 2 distinct palindromic prime factors.
%H A046404 Harvey P. Dale, <a href="/A046404/b046404.txt">Table of n, a(n) for n = 1..501</a>
%t A046404 dpf2Q[n_]:=Module[{pfs=Transpose[FactorInteger[n]][[1]],a,b},a=First[pfs];b=Last[pfs];PrimeNu[n]==PrimeOmega[n]==2 && a==FromDigits[Reverse[ IntegerDigits[ a]]] && b==FromDigits[Reverse[ IntegerDigits[b]]]]; Select[ Range[1,3801,2],dpf2Q] (* _Harvey P. Dale_, Jul 14 2013 *)
%Y A046404 Intersection of A033620 and A046388.
%Y A046404 Cf. A046372.
%K A046404 nonn,base
%O A046404 1,1
%A A046404 _Patrick De Geest_, Jun 15 1998
%E A046404 Offset changed by _Andrew Howroyd_, Aug 14 2024