This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A094181 #13 Sep 08 2022 08:45:13 %S A094181 0,0,1,2,3,8,5,16,18,36,9,48,11,80,77,88,15,144,17,168,153,216,21,256, %T A094181 110,308,207,352,27,484,29,416,377,540,341,648,35,680,525,768,39,1020, %U A094181 41,912,819,1008,45,1216,322,1320,893,1288,51,1656,765,1536,1113,1620 %N A094181 a(n) = (n - tau(n))*(n - phi(n)), where tau=A000005 and phi=A000010. %H A094181 Harvey P. Dale, <a href="/A094181/b094181.txt">Table of n, a(n) for n = 1..1000</a> %F A094181 a(n) = A049820(n)*A051953(n). %t A094181 Array[(#-DivisorSigma[0,#])(#-EulerPhi[#])&,60] (* _Harvey P. Dale_, May 18 2012 *) %o A094181 (Magma) [(n-NumberOfDivisors(n))*(n-EulerPhi(n)): n in [1..60]]; // _Vincenzo Librandi_, Aug 31 2018 %Y A094181 Cf. A062355. %K A094181 nonn %O A094181 1,4 %A A094181 _Reinhard Zumkeller_, May 06 2004