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%I A063870 #12 May 21 2023 22:19:31
%S A063870 480,2688,2095104,16854816,41055200,1839272960,5905219584,204004720640
%N A063870 Numbers n such that sigma(n) - usigma(n) = 3n/2.
%o A063870 (PARI) u(n) = sumdiv(n,d, if(gcd(d,n/d)==1,d)); for(n=1,10000, if(sigma(n)-u(n)==3*n/2,print(n)))
%Y A063870 Cf. A034448, A000203, A048146, A063846, A064591.
%K A063870 nonn
%O A063870 1,1
%A A063870 _Jason Earls_, Aug 27 2001
%E A063870 More terms from _Dean Hickerson_, Sep 25 2001
%E A063870 There are no others less than 1.5*10^13, but here's a larger one: 948990933336933380096. - _Dean Hickerson_, Sep 25 2001

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