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A116974
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Numbers n for which the sum of the proper divisors equals the product of the proper divisors.
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1
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2, 3, 5, 6, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277
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OFFSET
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1,1
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LINKS
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FORMULA
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Union of 6 and A000040: the prime numbers.
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MATHEMATICA
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fQ[n_] := Block[{id = Most@Divisors@n}, Plus @@ id == Times @@ id]; Select[Range@300, fQ@# &] (* Robert G. Wilson v, Apr 03 2006 *)
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PROG
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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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Luc Stevens (lms022(AT)yahoo.com), Apr 01 2006
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STATUS
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approved
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