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%I #10 Oct 21 2019 02:20:47
%S 1,1,1,2,1,1,3,2,1,4,1,2,15,1,1,6,1,4,21,2,1,8,5,2,27,4,1,30,1,1,33,2,
%T 35,12,1,2,39,8,1,42,1,4,45,2,1,16,7,10,51,4,1,54,55,8,57,2,1,60,1,2,
%U 63,1,65,66,1,4,69,70,1,24,1,2,75,4
%N a(n) is the GCD of n and the product of the anti-divisors of n.
%C See A066272 for definition of anti-divisor.
%F a(n) = gcd(n, A091507(n)).
%e The anti-divisors of 18 are 4, 5, 7, 12. Hence a(18) = gcd(4*5*7*12, 18) = 6.
%Y Cf. A066417, A091507, A093395, A093396.
%K nonn
%O 3,4
%A _Lior Manor_, Mar 28 2004
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