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 A141204 Let sequences X and Y consist of the least positive integers such that 2X+Y is the complement of X and X+Y is the complement of Y, starting with X(1)=1 and Y(1)=1; then this sequence equals X, while 2X+Y=A141205, Y=A141206 and X+Y=A141207. 4
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 OFFSET 1,2 LINKS Paul D Hanna, Table of n, a(n) for n = 1..420 FORMULA CONJECTURES on evaluating limits. The following limits exist for some irrational q and r: Limit X(n)/n = 1 + q, Limit {2X+Y}(n)/n = 1 + 1/q and Limit Y(n)/n = 1 + r, Limit {X+Y}(n)/n = 1 + 1/r. Thus q and r can be defined by: Limit X(n)/{2X+Y}(n) = q = (1 + q)/(3 + 2*q + r) and Limit Y(n)/{X+Y}(n) = r = (1 + r)/(2 + r + q). Therefore q = least positive real root that satisfies: 1 - 4*q + 2*q^2 + 2*q^3 = 0, giving q = 0.31544880690757230308868993... Also, r = least positive real root that satisfies: 2 - 4*r + r^3 = 0, giving r = 0.5391888728108891165258759... EXAMPLE Union of X and 2X+Y = positive integers: X=[1,2,4,5,6,8,9,10,11,13,14,15,17,18,20,21,22,23,24,...]; 2X+Y=[3,7,12,16,19,25,28,32,36,41,44,48,54,57,63,66,70,...]. Limit X(n)/{2X+Y}(n) = 0.3154488069... Union of Y and X+Y = positive integers: Y=[1,3,4,6,7,9,10,12,14,15,16,18,20,21,23,24,26,27,29,...]; X+Y=[2,5,8,11,13,17,19,22,25,28,30,33,37,39,43,45,48,50,...]. Limit Y(n)/{X+Y}(n) = 0.5391888728... PROG (PARI) /* Print a(n), n=1..100: */ {A=[1]; B=[3]; C=[1]; D=[2]; print1(A[1]", "); for(n=1, 100, for(j=2, 4*n, if(setsearch(Set(concat(A, B)), j)==0, At=concat(A, j); for(k=2*j+1, 6*n, if(setsearch(Set(concat(At, B)), k)==0, if(setsearch(Set(concat(C, D)), k-2*j)==0, if(setsearch(Set(concat(C, D)), k-j)==0, A=At; B=concat(B, k); C=concat(C, k-2*j); D=concat(D, k-j); print1(A[ #A]", "); break); break))))))} CROSSREFS Cf. A141205 (2X+Y), A141206 (Y), A141207 (X+Y). Sequence in context: A286924 A039100 A184482 * A160992 A096997 A187480 Adjacent sequences: A141201 A141202 A141203 * A141205 A141206 A141207 KEYWORD nonn AUTHOR Paul D. Hanna, Jun 21 2008 STATUS approved

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Last modified February 8 11:11 EST 2023. Contains 360138 sequences. (Running on oeis4.)