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 A050732 #12 Oct 16 2019 01:19:13 %S A050732 1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,131072, %T A050732 1048576,2097152,4194304,268435456,536870912,1073741824,2147483648, %U A050732 4294967296,17179869184,34359738368,68719476736,137438953472 %N A050732 Numbers of form 2^k (for values of k see A050723) containing no pair of consecutive equal digits (probably finite). %H A050732 <a href="/index/Di#divseq">Index to divisibility sequences</a> %e A050732 2^18 = 262144 is missing, for example. %t A050732 Select[2^Range[0,40],FreeQ[Differences[IntegerDigits[#]],0] &] (* _Jayanta Basu_, May 31 2013 *) %Y A050732 Cf. A043096, A050723. %K A050732 nonn,base %O A050732 1,2 %A A050732 _Patrick De Geest_, Sep 15 1999