Search: id:A127992
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%I A127992
%S A127992 1,2,2,2,2,3,2,2,3,3,2,3,2,2,2,3,2,2,2,2,2,3,4,2,3,3,3,3,3,3,2,4,3,2,2,
%T A127992 3,3,2,3,2,3,2,3,4,3,2,3,2,4,3,4,3,2,2,3,2,2,4,2,3,4,3,3,3,4,3,2,2,2,3,
%U A127992 3,4,3,3,4,3,3,4,4,2,2,2,3,3,3,4,3,4,2,3,2,2,3,3,3,2,4,3,2,3,4,2,3,2,4
%N A127992 Number of different prime factors of 2n^3 - 2n + 9.
%C A127992 All numbers generated by the irreducible polynomial 2n^3 - 2n + 9 (A127979) 
               are odd and composite. Largest prime factor A127990, number of prime 
               factors A127992
%t A127992 a = {}; Do[AppendTo[a, 2n^3 - 2n + 9], {n, 1, 300}]; b = {}; Do[c = FactorInteger[a[[n]]]; 
               d = Length[c]; AppendTo[b, d], {n, 1, Length[a]}]; b (*Artur Jasinski*)
%Y A127992 Cf. A127979, A127990.
%Y A127992 Sequence in context: A033618 A061357 A138139 this_sequence A067595 A134868 
               A127417
%Y A127992 Adjacent sequences: A127989 A127990 A127991 this_sequence A127993 A127994 
               A127995
%K A127992 nonn
%O A127992 1,2
%A A127992 Artur Jasinski (grafix(AT)csl.pl), Feb 10 2007

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