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 A036344 #25 Feb 16 2025 08:32:37 %S A036344 2,3,5,7,11,23,43,67,89,109,4567,10987,76543,23456789,6543211211, %T A036344 4321121110987,23456789101112123,891011121234567891011, %U A036344 3211211109876543211211,23456789101112123456789101112123,43211211109876543211211109876543,567891011121234567891011121234567891011 %N A036344 Prime concatenated analog clock numbers (clockwise and counterclockwise). %C A036344 The hours 10, 11 and 12 are taken 'complete and unreversed'. %H A036344 Michael S. Branicky, <a href="/A036344/b036344.txt">Table of n, a(n) for n = 1..40</a> %H A036344 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_019.htm">Puzzle 19. Primes on a clock</a>, The Prime Puzzles & Problems Connection. %H A036344 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ClockPrime.html">Clock Prime</a>. %F A036344 Union of A036342 and A036343. - _Sean A. Irvine_, Oct 26 2020 %Y A036344 Cf. A034326, A036342, A036343. %K A036344 nonn,base %O A036344 1,1 %A A036344 _Patrick De Geest_, Dec 15 1998 %E A036344 Offset corrected and a(21) from _Sean A. Irvine_, Oct 26 2020 %E A036344 a(22) and beyond from _Michael S. Branicky_, May 20 2024