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%I #9 Dec 27 2023 13:09:16
%S 0,1,0,1,4,5,0,1,2,9,4,5,12,13,0,1,4,5,2,9,20,21,4,1,4,1,12,13,28,29,
%T 0,1,32,33,4,5,36,37,2,9,40,41,20,13,14,45,4,5,2,9,4,25,4,5,12,13,56,
%U 57,28,29,60,9,0,1,64,65,32,33,68,69,4,5,72,13,36,37,76,77,2,1,2,81,40,41
%N a(n) = A075423(A075423(n)).
%C From _Robert Israel_, Apr 11 2019: (Start)
%C a(n) == n (mod 2).
%C a(n) = 0 iff n is in A000079.
%C a(n) = n-2 iff n-1 is in A007674. (End)
%H Robert Israel, <a href="/A075424/b075424.txt">Table of n, a(n) for n = 2..10000</a>
%p A075423:= n -> convert(numtheory:-factorset(n),`*`)-1:
%p map(A075423@@2, [$2..100]); # _Robert Israel_, Apr 11 2019
%Y Cf. A000079, A007674, A075423, A075425.
%K nonn,look
%O 2,5
%A _Reinhard Zumkeller_, Sep 15 2002
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