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A033023
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Numbers whose base-10 expansion has no run of digits with length < 2.
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17
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11, 22, 33, 44, 55, 66, 77, 88, 99, 111, 222, 333, 444, 555, 666, 777, 888, 999, 1100, 1111, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 2200, 2211, 2222, 2233, 2244, 2255, 2266, 2277, 2288, 2299, 3300, 3311, 3322, 3333
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 10]]]>1&] (* Vincenzo Librandi, Feb 05 2014 *)
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PROG
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(PARI) is(n)={n=digits(n); while(#n>2 && n[2]==n[1], n=if(n[3]==n[1], n[^1], n[3..-1])); #n>1&&n[1]==n[2]} \\ M. F. Hasler, Jun 24 2016
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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