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 A336821 #28 Aug 20 2020 21:03:30 %S A336821 2,4,14,17,31,41,131,141,241,441,1441,4441,14441,17441 %N A336821 a(n) is the smallest positive integer greater than a(n-1) containing n syllables in Spanish, starting from a(1) = 2. %C A336821 Note that 1 has two syllables (u-no) but 1 is not in the sequence because 1 < 2. %D A336821 Rodolfo Kurchan, Diversiones con Números y Figuras, Ediciones de Mente, (2000), problem 14. %e A336821 a(1) = 2 since "dos" is the least number to have only one syllable. %e A336821 a(2) = 4 because "cuatro" is the first number > 2 to have two syllables: cua-tro. %e A336821 a(3) = 14 because "catorce" is the first number > 4 to have three syllables: ca-tor-ce. %e A336821 a(4) = 17 because "diecisiete" is the first number > 14 to have four syllables: die-ci-sie-te. %e A336821 a(5) = 31 because "treinta y uno" is the first number > 17 to have five syllables: trein-ta-y-u-no. %Y A336821 Cf. A002810. %K A336821 nonn,word,less,more %O A336821 1,1 %A A336821 _Rodolfo Kurchan_, Aug 04 2020