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1, 0, -1, -1, -2, -1, -2, -2, -2, -1, -2, -2, -3, -2, -1, 0, -1, -1, -2, -2, -1, 0, -1, -1, -1, 0, 0, 0, -1, -2, -3, -3, -2, -1, 0, 0, -1, 0, 1, 1, 0, -1, -2, -2, -2, -1, -2, -3, -3, -3, -2, -2, -3, -3, -2, -2, -1, 0, -1, -1, -2, -1, -1, -1, 0, -1, -2, -2, -1, -2, -3, -3
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,5
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LINKS
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MATHEMATICA
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Accumulate@ Table[If[n == 1, 1, Apply[Times, FactorInteger[n] /. {p_, e_} /; p > 0 :> If[IntegerQ@ Sqrt@ e, (-1)^Sqrt@ e, 0]]], {n, 72}] (* Michael De Vlieger, Jan 27 2019 *)
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PROG
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(PARI) f(n) = {my(f=factor(n)[, 2]); prod(i=1, #f, if(issquare(f[i]), (-1)^sqrtint(f[i]), 0)); }; \\ A197774
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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