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A075743
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For all numbers of the form 6 +- 1 starting with 5,7,11,13,..., '1' indicates prime and '0' indicates composite.
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7
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1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1
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OFFSET
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1,1
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COMMENTS
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The sequence may described as: for all numbers k(n) [k(n) = 6*ceiling(n/2) + (-1)^n] congruent to -1 or +1 (mod 6) starting with k(n) = {5,7,11,13,...}, a(k(n)) is 1 if k(n) is prime and 0 if k(n) is composite. - Daniel Forgues, Mar 01 2009
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LINKS
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FORMULA
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MATHEMATICA
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Boole[PrimeQ/@Flatten[Table[6n+{-1, 1}, {n, 60}]]] (* Harvey P. Dale, Jun 04 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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Stephan Wagler (stephanwagler(AT)aol.com), Oct 08 2002
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EXTENSIONS
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STATUS
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approved
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