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 A152993 #8 Sep 16 2020 12:27:27
%S A152993 1,0,0,0,1,0,2,1,3,3,5,2,6,5,6,6,9,6,10,7,10,11,13,8,14,14,15,14,18,
%T A152993 13,19,16,19,20,21,17,24,23,24,21,27,22,28,25,26,29,31,24,32,30,33,32,
%U A152993 36,31,36,33,38,39,41,32,42,41,40,40,44,41,47,44,47,44
%N A152993 a(n) = n - d(n) - pi(n) + 1.
%H A152993 Andrew Howroyd, <a href="/A152993/b152993.txt">Table of n, a(n) for n = 1..1000</a>
%F A152993 a(n) = n - A000005(n) - A000720(n) + 1.
%t A152993 Table[n-DivisorSigma[0,n]-PrimePi[n]+1,{n,70}] (* _Harvey P. Dale_, Sep 16 2020 *)
%o A152993 (PARI) a(n) = {n - numdiv(n) - primepi(n) + 1} \\ _Andrew Howroyd_, Jan 03 2020
%Y A152993 Cf. A000005, A000720, A152770, A152991, A152992.
%K A152993 easy,nonn
%O A152993 1,7
%A A152993 _Omar E. Pol_, Dec 19 2008
%E A152993 Terms a(17) and beyond from _Andrew Howroyd_, Jan 03 2020