|
%I #8 Jul 31 2015 21:28:13
%S 2,3,5,6,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,
%T 89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,
%U 179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277
%N Numbers n for which the sum of the proper divisors equals the product of the proper divisors.
%F Union of 6 and A000040: the prime numbers.
%t fQ[n_] := Block[{id = Most@Divisors@n}, Plus @@ id == Times @@ id]; Select[Range@300, fQ@# &] (* _Robert G. Wilson v_, Apr 03 2006 *)
%o (PARI) a(n)=if(n<5,[2,3,5,6][n],prime(n+1)) \\ _Charles R Greathouse IV_, Aug 26 2011
%K nonn,easy
%O 1,1
%A Luc Stevens (lms022(AT)yahoo.com), Apr 01 2006
|
