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A219732
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a(n) = (Product_{i=1..n-1} (2^i + 1)) modulo (2^n - 1).
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1
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0, 0, 1, 0, 1, 9, 1, 0, 74, 33, 1, 1170, 1, 129, 15101, 0, 1, 187758, 1, 67650, 615700, 2049, 1, 4793490, 3247204, 8193, 262658, 4227330, 1, 480000312, 1, 0, 2458463380, 131073, 10787055277, 19903096980, 1, 524289, 67117058, 567489872400, 1, 2686322969514, 1
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OFFSET
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1,6
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COMMENTS
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E. Vantieghem proved that a(n) = 1 if and only if n is an odd prime. - Michel Marcus, Nov 26 2012
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LINKS
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FORMULA
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a(n) = A028362(n) modulo (2^n - 1).
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MATHEMATICA
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Join[{0}, Table[m = 2^n - 1; prod = 1; Do[prod = Mod[prod*(2^i + 1), m], {i, n - 1}]; prod, {n, 2, 40}]] (* T. D. Noe, Nov 27 2012 *)
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PROG
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(PARI) a(m) = {for (n=1, m, print1(prod(j=1, n-1, 2^j+1) % (2^n - 1), ", "); ); }
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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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