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 A088471 #26 Sep 14 2017 15:31:57
%S A088471 9,9,9,9,9,9,9,9,9,90,123456789987654321,19,19,19,19,19,19,19,19,90,
%T A088471 91,2345678998765432,29,29,29,29,29,29,29,90,91,92,34567899876543,39,
%U A088471 39,39,39,39,39,90,91,92,93,456789987654,49,49,49,49,49,90,91,92
%N A088471 Lunar product of distinct lunar prime divisors of n.
%C A088471 a(n) = Product_{p is a lunar divisor of n} p. (Each prime appears at most once in this product.)
%H A088471 D. Applegate, <a href="/A087061/a087061.txt">C program for lunar arithmetic and number theory</a> [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
%H A088471 D. Applegate, M. LeBrun and N. J. A. Sloane, <a href="http://arxiv.org/abs/1107.1130">Dismal Arithmetic</a> [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
%H A088471 D. Applegate, M. LeBrun, N. J. A. Sloane, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL14/Sloane/carry2.html">Dismal Arithmetic</a>, J. Int. Seq. 14 (2011) # 11.9.8.
%H A088471 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a>
%Y A088471 Cf. A088469, A088470.
%K A088471 nonn
%O A088471 1,1
%A A088471 _David Applegate_, Nov 11 2003