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 A052088 #12 Oct 17 2019 22:05:23 %S A052088 43,109,2221,2423,3433,4241,5857,7069,7877,8887,10099,10987,76543, %T A052088 102101,108107,112111,114113,124123,148147,154153,160159,172171, %U A052088 180179,192191,198197,202201,208207,210209,214213,238237,244243,262261 %N A052088 Primes whose decimal expansion is a concatenation of two or more consecutive decreasing numbers (no leading zeros allowed). %H A052088 Paul Tek, <a href="/A052088/b052088.txt">Table of n, a(n) for n = 1..10000</a> %Y A052088 Cf. A052087, A030458, A052089. %K A052088 nonn,base %O A052088 1,1 %A A052088 _Patrick De Geest_, Jan 15 2000 %E A052088 Initial data corrected by _Paul Tek_, May 07 2013