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 A161386 #4 Jun 02 2025 01:43:59 %S A161386 3,4,5,5,4,5,10,10,10,11,11,13,12,13,14,14,15,11,13,11,12,13,12,13,13, %T A161386 9,10,11,11,11,17,17,19,19,20,19,21,18,19,18,19,17,17,18,19,19,14,20, %U A161386 21,21,22,23,22,23,25,22,23,21,23,21,22,22,16,15,16,21,22,24,25,25,25,26 %N A161386 Number of letters in n-th prime (in Spanish). %C A161386 a(13)=12 because 41='Cuarenta y uno' contains 12 letters %Y A161386 A049528 %K A161386 nonn,word %O A161386 1,1 %A A161386 _Claudio Meller_, Jun 08 2009