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 A368361 #14 Jan 16 2024 16:17:05
%S A368361 13,35,57,79,91,11,31,51,71,92,12,32,52,72,93,13,33,53,73,94,14,34,54,
%T A368361 74,95,15,35,55,75,96,16,36,56,76,97,17,37,57,77,98,18,38,58,78,99,19,
%U A368361 39,59,79,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91
%N A368361 Comma transform of the odd numbers.
%C A368361 See A367360 for further information.
%H A368361 Alois P. Heinz, <a href="/A368361/b368361.txt">Table of n, a(n) for n = 0..10000</a>
%p A368361 a:= n-> parse(cat(""||(2*n+1)[-1], ""||(2*n+3)[1])):
%p A368361 seq(a(n), n=0..79); # _Alois P. Heinz_, Jan 03 2024
%o A368361 (Python)
%o A368361 def A368361(n): return (10,30,50,70,90)[n%5]+int(str((n<<1)+3)[0]) # _Chai Wah Wu_, Jan 03 2024
%Y A368361 Cf. A005408, A367360.
%K A368361 nonn,base
%O A368361 0,1
%A A368361 _N. J. A. Sloane_, Jan 02 2024