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 A105387 #14 Jan 07 2022 19:32:10 %S A105387 2,7,5,3,1,13,1,15,3,8,2,11,0,1,0,9,2,5,7,0,6,14,4,6,4,3 %N A105387 Morse code alphabet where "-" = 0 and "." = 1, binary converted to decimal. %C A105387 Hamming weight A000120(a(n)) gives number of dashes in the Morse code of the n-th letter. A008777 allows us to know how many leading zeros a term should have. A059852 is a better (unambiguous) variant. - _M. F. Hasler_, Jun 23 2020 %H A105387 Omniglot, <a href="http://www.omniglot.com/writing/morsecode.htm">Morse Code</a> %e A105387 a(3) = 'C' = "-.-." -> 0101 (binary) = 5. %o A105387 (PARI) A105387=[fromdigits([2-d|d<-digits(t,3)],2)|t<-A059852] \\ _M. F. Hasler_, Jun 23 2020 %Y A105387 Cf. A105386, A059852 (Morse alphabet), A000120 (binary weight), A008777 (number of dots and dashes in Morse code for n-th letter). %K A105387 full,nonn,fini %O A105387 1,1 %A A105387 Bryan Jacobs (bryanjj(AT)gmail.com), Apr 02 2005 %E A105387 Name and crossrefs edited by _M. F. Hasler_, Jun 23 2020