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A176101
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a(n) = 4^(composite(n) - 4) mod composite(n+4).
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1
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1, 4, 4, 4, 0, 16, 16, 16, 16, 16, 21, 10, 1, 16, 4, 0, 31, 18, 16, 4, 16, 1, 24, 16, 36, 34, 18, 16, 46, 4, 16, 16, 28, 26, 16, 7, 54, 4, 16, 16, 0, 16, 64, 64, 58, 4, 16, 70, 49, 64, 9, 22, 64, 55, 64, 16, 1, 44, 25, 56, 64, 74, 48, 70, 74, 49, 64, 44, 1, 4, 52, 48, 79, 36, 88, 56, 58, 64, 112, 31
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(2)=6 because 4^(composite(2) - 4) mod composite(2+4) = 16 mod 12 = 4.
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MAPLE
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MATHEMATICA
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With[{cmps=Partition[Select[Range[200], CompositeQ], 5, 1]}, PowerMod[4, #[[1]]-4, #[[5]]]&/@cmps] (* Harvey P. Dale, Dec 06 2020 *)
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CROSSREFS
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KEYWORD
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nonn,less
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AUTHOR
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STATUS
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approved
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