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A079411
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a(1)=1, a(n) = n - a(a(ceiling(n/2))).
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2
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1, 1, 2, 3, 4, 5, 5, 6, 6, 7, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 23, 24, 25, 25, 26, 26, 27, 27, 28, 29, 30, 30, 31, 31, 32, 33, 34, 34, 35, 35, 36, 36, 37, 38, 39, 39, 40, 40, 41, 42, 43, 43, 44, 44, 45, 46, 47, 47, 48, 49, 50, 51, 52, 53, 54
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) is asymptotic to n*(sqrt(3)-1); conjecture: (a(n)-n*(sqrt(3)-1))/log(n) is bounded.
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MAPLE
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f:= proc(n) option remember;
n - procname(procname(ceil(n/2)))
end proc:
f(1):= 1:
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MATHEMATICA
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Fold[Append[#1, #2 - #1[[#1[[Ceiling[#2/2] ]] ]] ] &, {1}, Range[2, 74]] (* Michael De Vlieger, Oct 24 2017 *)
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PROG
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(PARI) a(n)=if(n<2, 1, n-a(a(ceil(n/2))))
(Magma) [n eq 1 select 1 else n-Self(Self(Ceiling(n/2))): n in [1..80]]; // Vincenzo Librandi, Oct 25 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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