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gpf(m) - 2*spf(m), where gpf(m) is the greatest and spf(m) is the smallest prime factor of m (A006530, A020639).
4

%I #3 Mar 30 2012 18:50:31

%S -1,-2,-3,-2,-5,-1,-7,-2,-3,1,-11,-1,-13,3,-1,-2,-17,-1,-19,1,1,7,-23,

%T -1,-5,9,-3,3,-29,1,-31,-2,5,13,-3,-1,-37,15,7,1,-41,3,-43,7,-1,19,

%U -47,-1,-7,1,11,9,-53,-1,1,3,13,25,-59,1,-61,27,1,-2,3,7,-67,13,17,3,-71,-1,-73,33,-1,15

%N gpf(m) - 2*spf(m), where gpf(m) is the greatest and spf(m) is the smallest prime factor of m (A006530, A020639).

%Y Cf. A046665, A081304, A081305, A081306, A069900.

%K sign

%O 1,2

%A _Reinhard Zumkeller_, Mar 17 2003