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 A063038 #15 Apr 13 2024 14:58:44
%S A063038 0,0,3,5,9,10,16,18,24,27,34,35,44,48,54,59,68,70,80,83,92,99,108,109,
%T A063038 122,128,136,142,154,156,170,175,185,194,203,207,223,230,239,244,260,
%U A063038 264,279,285,295,307,320,322,340,347,360,368,383,388,403,411,426,437
%N A063038 a(n) = floor(n*sqrt(n)) - d(n), where d(n) is the number of divisors function.
%F A063038 a(n) = A000093(n) - A000005(n). - _Michel Marcus_, Apr 13 2024
%t A063038 Table[Floor[n*Sqrt[n]] - DivisorSigma[0, n], {n, 50}] (* _Wesley Ivan Hurt_, Jun 09 2014 *)
%o A063038 (PARI) j=[]; for(n=1,100,j=concat(j,floor(n*sqrt(n))-numdiv(n))); j
%Y A063038 Cf. A000005, A000093, A055682.
%K A063038 easy,nonn
%O A063038 1,3
%A A063038 _Jason Earls_, Aug 03 2001