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 A102673 Number of digits >= 4 in decimal representation of n. 2
 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,45 COMMENTS a(n) = 0 iff n is in A007090 (numbers in base 4). - Bernard Schott, Feb 01 2023 LINKS Hieronymus Fischer, Table of n, a(n) for n = 0..10000 FORMULA From Hieronymus Fischer, Jun 10 2012: (Start) a(n) = Sum_{j=1..m+1} (floor(n/10^j + 3/5) - floor(n/10^j)), where m = floor(log_10(n)). G.f.: g(x) = (1/(1-x))*Sum_{j>=0} (x^(4*10^j) - x^(10*10^j))/(1 - x^10^(j+1)). (End) MAPLE p:=proc(n) local b, ct, j: b:=convert(n, base, 10): ct:=0: for j from 1 to nops(b) do if b[j]>=4 then ct:=ct+1 else ct:=ct fi od: ct: end: seq(p(n), n=0..125); # Emeric Deutsch, Feb 22 2005 MATHEMATICA Table[Total@ Take[DigitCount@ n, {4, 9}], {n, 0, 104}] (* Michael De Vlieger, Aug 17 2017 *) CROSSREFS Cf. A027868, A054899, A055640, A055641, A102669-A102685, A117804, A122840, A122841, A160093, A160094, A196563, A196564. Partial sums see A102674. Cf. A000120, A000788, A007090, A023416, A059015 (for base 2). Sequence in context: A360078 A027354 A192227 * A085297 A080972 A037814 Adjacent sequences: A102670 A102671 A102672 * A102674 A102675 A102676 KEYWORD nonn,base,easy AUTHOR N. J. A. Sloane, Feb 03 2005 EXTENSIONS More terms from Emeric Deutsch, Feb 22 2005 STATUS approved

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Last modified August 12 12:46 EDT 2024. Contains 375092 sequences. (Running on oeis4.)