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 A252055 Number of products A000201(i)*A001950(j) = n. 1
 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 2, 1, 0, 2, 0, 2, 1, 1, 1, 1, 0, 1, 0, 3, 0, 2, 1, 1, 0, 2, 0, 1, 0, 1, 2, 2, 1, 2, 0, 2, 2, 0, 1, 1, 1, 1, 0, 2, 0, 3, 1, 1, 1, 1, 0, 6, 0, 1, 1, 1, 1, 1, 0, 1, 1, 3, 0, 1, 1, 1, 1, 1, 1, 3, 0, 4, 1, 0, 1, 3, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,15 COMMENTS A000201 and A001950 are the lower and upper Wythoff sequences, which partition the nonnegative integers. Does this sequence include every nonnegative integer?  What is the maximal number of consecutive 0's?  What is the maximal number of consecutive 1's? LINKS Clark Kimberling, Table of n, a(n) for n = 1..1000 EXAMPLE a(312) counts these 7 products:  3*104, 4*78, 6*52, 8*39, 12*26, 24*13, 156*2 MAPLE N:= 1000: # to get a(1) to a(N) A201:= [seq(floor(n*phi), n=1..N)]: A1950:= [seq(floor(n*phi^2), n=1..N)]: A:= Vector(N): for i from 1 to N do   for j from 1 do     m:= A201[i]*A1950[j];     if m > N then break fi;     A[m]:= A[m]+1;    od od: convert(A, list); # Robert Israel, Dec 23 2014 MATHEMATICA r = (1 + Sqrt[5])/2; s = r/(r - 1); t = Flatten[Table[Floor[r*j]*Floor[s*k], {j, 1, 300}, {k, 1, 300}]]; a[n_] := Count[t, n]; u = Table[a[n], {n, 1, 300}] CROSSREFS Cf. A000201, A001950. Sequence in context: A140397 A120614 A287516 * A324144 A320836 A097567 Adjacent sequences:  A252052 A252053 A252054 * A252056 A252057 A252058 KEYWORD nonn,easy AUTHOR Clark Kimberling, Dec 23 2014 STATUS approved

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Last modified December 3 05:05 EST 2021. Contains 349445 sequences. (Running on oeis4.)