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 A054047 #11 Jul 02 2025 16:01:59 %S A054047 0,1,6,8,9,10,11,16,18,19,60,61,66,68,69,80,81,86,88,89,90,91,96,98, %T A054047 99,100,101,106,108,109,110,111,116,118,119,160,161,166,168,169,180, %U A054047 181,186,188,189,190,191,196,198,199,600,601,606,608,609,610,611,616,618 %N A054047 Numbers which can be read as (possibly different) numbers when rotated by 180 degrees (final zeros allowed). %D A054047 A. Zalmanski, Some fun with figures and letters, unpublished. %Y A054047 Cf. A006933, A014254, A045574. %K A054047 nonn,base,easy %O A054047 0,3 %A A054047 Alain Zalmanski (alain.zalmanski(AT)cybercable.fr), Apr 28 2000 %E A054047 Corrected and extended by _James Sellers_, Apr 30 2000