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 A033029 #14 Aug 14 2021 18:53:22 %S A033029 17,34,51,68,85,102,119,136,153,170,187,204,221,238,255,273,546,819, %T A033029 1092,1365,1638,1911,2184,2457,2730,3003,3276,3549,3822,4095,4352, %U A033029 4369,4386,4403,4420,4437,4454,4471,4488,4505,4522,4539 %N A033029 Numbers whose base-16 expansion has no run of digits with length < 2. %C A033029 First term that is not a multiple of 17 (A008599) is 273, which is one more than 272 = 16 * 17. In hexadecimal, 272 is 110, which having a single 0 next to a 1, disqualifies it from this sequence. - _Alonso del Arte_, Oct 16 2016 %H A033029 Vincenzo Librandi, <a href="/A033029/b033029.txt">Table of n, a(n) for n = 1..1000</a> %e A033029 255 in hexadecimal is FF, a run of two Fs, hence 255 is in the sequence. %e A033029 273 in hexadecimal is 111, a run of three 1s, hence 273 is in the sequence. %e A033029 291 in hexadecimal is 123, three distinct single digits, so 291 is not in the sequence. %t A033029 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 16]]] > 1 &] (* _Vincenzo Librandi_, Feb 05 2014 *) %K A033029 nonn,base %O A033029 1,1 %A A033029 _Clark Kimberling_