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 A356863 #18 Sep 04 2022 12:45:19 %S A356863 12,16,18,24,36,113131311886868688,153535351846464648, %T A356863 182919281817080718,183838381816161618,185676581814323418, %U A356863 192919291807080708,193838391806161608,283919382716080617,293656392403040304,293919392706080607,365838563634161436,385838583614161416,387676783612323216,567838765432161234,587838785412161214 %N A356863 Numbers that are the product of two palindromes in two or more ways and are the concatenation of two palindromes, with all the palindromes having the same number of decimal digits. %C A356863 Numbers in A355148 with more than 1 decomposition. %e A356863 12 = 3*4 = 2*6. %e A356863 16 = 4*4 = 2*8. %e A356863 18 = 2*9 = 3*6. %e A356863 24 = 4*6 = 3*8. %e A356863 36 = 4*9 = 6*6. %e A356863 113131311886868688 = 279747972*404404404 = 254545452*444444444 = 252252252*448484844. %e A356863 153535351846464648 = 189828981*808808808 = 172727271*888888888. %Y A356863 Cf. A002113, A355148. %K A356863 nonn,base %O A356863 1,1 %A A356863 _Chai Wah Wu_, Sep 01 2022