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 A043276 a(n) = maximal run length in base-2 representation of n. 32
 1, 1, 2, 2, 1, 2, 3, 3, 2, 1, 2, 2, 2, 3, 4, 4, 3, 2, 2, 2, 1, 2, 3, 3, 2, 2, 2, 3, 3, 4, 5, 5, 4, 3, 3, 2, 2, 2, 3, 3, 2, 1, 2, 2, 2, 3, 4, 4, 3, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 5, 6, 6, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 3, 4, 4, 3, 2, 2, 2, 1, 2, 3, 3, 2, 2, 2, 3, 3, 4, 5, 5, 4, 3, 3, 2, 2, 2, 3, 3, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS First occurrence of k is when n=2^k-1 and there is no last occurrence. - Robert G. Wilson v, Dec 14 2008 Sequences A000975, A037969, A037970, A037971 list numbers for which a(n)=1, a(n)=2, a(n)=3, a(n)=4. - M. F. Hasler, Jul 23 2013 a(n) = max(A101211(n,k): k = 1..A005811(n)). - Reinhard Zumkeller, Dec 16 2013 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA f[n_] := Max @@ Length /@ Split@IntegerDigits[n, 2]; Array[f, 105] (* Robert G. Wilson v, Dec 14 2008 *) PROG (PARI) A043276(n, b=2)={my(m, c=1); while(n>0, n%b==(n\=b)%b && c++ && next; m=max(m, c); c=1); m} \\ - M. F. Hasler, Jul 23 2013 (PARI) a(n)=my(r, t); while(n, t=valuation(n, 2); if(t>r, r=t); n>>=t; t=valuation(n+1, 2); if(t>r, r=t); n>>=t); r \\ Charles R Greathouse IV, Nov 02 2016 (Haskell) a043276 = maximum . a101211_row  -- Reinhard Zumkeller, Dec 16 2013 CROSSREFS Cf. A043277-A043290 for base-3 to base-16 analogs. Sequence in context: A106580 A165915 A269783 * A319416 A284559 A284583 Adjacent sequences:  A043273 A043274 A043275 * A043277 A043278 A043279 KEYWORD nonn,base,look AUTHOR EXTENSIONS More terms from Robert G. Wilson v, Dec 14 2008 STATUS approved

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Last modified December 12 15:11 EST 2019. Contains 329960 sequences. (Running on oeis4.)