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 A329472 #16 Oct 21 2020 02:55:50 %S A329472 4,12,21,33,49,67,87,111,136,163,191,223,259,299,343,388,436,485,535, %T A329472 587,641,697,757,820,884,952,1024,1099,1175,1255,1336,1420,1508,1598, %U A329472 1690,1786,1884,1983,2083,2187,2295,2407,2523,2640,2760,2881,3005,3130,3256 %N A329472 Partial sums of numbers that are not squarefree. %H A329472 Metin Sariyar, <a href="/A329472/b329472.txt">Table of n, a(n) for n = 1..16000</a> %F A329472 a(n) ~ (Pi^2/(2*Pi^2 - 12)) * n^2. - _Amiram Eldar_, Oct 21 2020 %e A329472 49 is a term because 4, 8, 9, 12, 16 are the first five nonsquarefree numbers and 4 + 8 + 9 + 12 + 16 = 49. %t A329472 Accumulate[Select[Range[1000], !SquareFreeQ[#]&]] %Y A329472 Partial sums of A013929. %Y A329472 Cf. A005117, A173143. %K A329472 nonn,easy %O A329472 1,1 %A A329472 _Metin Sariyar_, Nov 13 2019