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 A028562 #10 Aug 11 2024 14:41:29 %S A028562 0,7,55,616,19591,76167,515515,749947,7474747,72999927,236799997632, %T A028562 769437734967,1900289820091,2998954598992,5170703070715,5934592954395, %U A028562 29175111157192,51175166157115,57154688645175,211106050601112,570608929806075,574823545328475 %N A028562 Palindromes of form k*(k+6). %H A028562 Michael S. Branicky, <a href="/A028562/b028562.txt">Table of n, a(n) for n = 1..35</a> %H A028562 P. De Geest, <a href="https://www.worldofnumbers.com/consemor.htm">Palindromic Quasipronics of the form n(n+x)</a> %F A028562 a(n) = A028561(n) * (A028561(n) + 6). - _Michael S. Branicky_, Jan 25 2022 %o A028562 (Python) %o A028562 from itertools import count, islice %o A028562 def ispal(n): s = str(n); return s == s[::-1] %o A028562 def agen(): %o A028562 for k in count(0): %o A028562 if ispal(k*(k+6)): %o A028562 yield k*(k+6) %o A028562 print(list(islice(agen(), 19))) # _Michael S. Branicky_, Jan 25 2022 %Y A028562 Cf. A028560, A028561. %K A028562 nonn,base %O A028562 1,2 %A A028562 _Patrick De Geest_ %E A028562 a(20) and beyond from _Michael S. Branicky_, Jan 25 2022