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A033014 Every run of digits of n in base 16 has length 2. 28

%I

%S 17,34,51,68,85,102,119,136,153,170,187,204,221,238,255,4352,4386,

%T 4403,4420,4437,4454,4471,4488,4505,4522,4539,4556,4573,4590,4607,

%U 8704,8721,8755,8772,8789,8806,8823,8840,8857,8874

%N Every run of digits of n in base 16 has length 2.

%H Vincenzo Librandi, <a href="/A033014/b033014.txt">Table of n, a(n) for n = 1..2000</a>

%F a(n) = 17*A043320(n) (= 17n for n<16, cf Example). - _M. F. Hasler_, Feb 02 2014

%e In base 16, a(1)=17 is written 11; the subsequent 14 values are the multiples of 17, corresponding to 22, 33, 44, ..., FF).

%e This is followed by a(16) = 4352 = 1100[16], then (still in base 16): 1122, 1133,..., 11FF, 2200, 2211, 2233, etc...

%t Select[Range[9000],Union[Length/@Split[IntegerDigits[#,16]]]=={2}&] (* _Harvey P. Dale_, Jan 19 2013 *)

%Y See A033001 for further cross-references.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified May 15 06:46 EDT 2021. Contains 343909 sequences. (Running on oeis4.)