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A015799 phi(n) + 8 | sigma(n). 1

%I #8 Dec 04 2021 17:01:45

%S 22,44,60,84,120,132,135,140,156,204,228,231,270,276,348,372,375,444,

%T 462,492,496,516,525,532,564,636,660,700,708,726,732,750,756,804,852,

%U 876,920,935,948,996,1050,1068,1164,1212,1236,1248,1284

%N phi(n) + 8 | sigma(n).

%t Select[Range[2000],Divisible[DivisorSigma[1,#],EulerPhi[#]+8]&] (* _Harvey P. Dale_, Dec 04 2021 *)

%o (PARI) is(n)=!(sigma(n)%eulerphi(n+8)) \\ _Charles R Greathouse IV_, Sep 25 2012

%K nonn

%O 1,1

%A _Robert G. Wilson v_

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)