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 A336822 #25 Jan 29 2025 19:37:07
%S A336822 3,4,6,8,10,11,12,15,17,19,20,23,24,26,28,33,34,36,38,40,41,42,45,47,
%T A336822 49,53,54,56,63,64,66,68,73,74,76,78,83,84,86,88,93,94,96,98,100,103,
%U A336822 104,106,108,110,111,112,115,117,119,120,123,124,126,128,133,134,136,138,140,141,142,145,147,149
%N A336822 Integers with an even number of letters when written in Spanish.
%D A336822 Rodolfo Kurchan, Problem 15, Diversiones con Números y Figuras, (2000).
%e A336822 a(4) = 8 because 8 in Spanish is written "ocho" and has 4 letters.
%t A336822 Select[Range@ 150, EvenQ@ StringLength@ StringDelete[IntegerName[#, {"Spanish"}], " "] &] (* _Michael De Vlieger_, Aug 21 2020 *)
%Y A336822 Cf. A001161.
%K A336822 nonn,word
%O A336822 1,1
%A A336822 _Rodolfo Kurchan_, Aug 04 2020