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 A046372 #6 Oct 10 2019 22:48:28 %S A046372 9,15,21,25,33,35,49,55,77,121,303,393,453,505,543,573,655,707,755, %T A046372 905,917,939,955,1057,1059,1111,1119,1149,1267,1337,1441,1565,1661, %U A046372 1765,1865,1915,1991,2101,2181,2191,2271,2361,2391,2471,2611,2681,2757,2787 %N A046372 Odd numbers with exactly 2 palindromic prime factors (counted with multiplicity). %Y A046372 Cf. A046315, A046404. %K A046372 nonn,base %O A046372 1,1 %A A046372 _Patrick De Geest_, Jun 15 1998