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A056653
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Composite numbers together with 1 but excluding 4.
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6
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1, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95
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OFFSET
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1,2
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COMMENTS
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These are also the numbers k such that k divides (k-1)!.
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LINKS
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MAPLE
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for n from 1 to 100 do
if irem(factorial(n-1), n) = 0 then print(n) end if;
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MATHEMATICA
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Select[ Range[ 1, 100 ], Mod[ (# - 1)!, # ] == 0 & ]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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