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A059880
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Positions of negative terms in A059876.
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2
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8, 32, 33, 34, 35, 36, 64, 65, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 152, 160, 161, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 272, 273, 274, 275
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OFFSET
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1,1
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LINKS
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MAPLE
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negative_terms(A059876); negative_terms := proc(b) local a, i; a := []; for i from 1 to nops(b) do if(b[i] < 0) then a := [op(a), i]; fi; od; RETURN(a); end;
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MATHEMATICA
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a[n_] := With[{s = Floor[Log[2, n]]}, (-1)^(n+1) + Sum[(-1)^(Floor[n/2^i] + 1)*Prime[i], {i, 1, s}] + If[1 == n, 1, Mod[s + 1, 2]*Prime[s]]];
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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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