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 A344471 #23 May 20 2021 22:50:16 %S A344471 1,6,12,18,24,36,48,54,72,96,108,144,192,216,288,384,432,576,648,768, %T A344471 864,960,1152,1296,1536,1728,1920,2304,2592,3072,3456,3840,4608,5184, %U A344471 6144,6912,7680,9216,10368,12288,13824,15360,18432,20736,23040,24576,27648 %N A344471 Number of points in the hexagonal lattice A_2 on the circle centered at the origin with squared radius A230655(n). %C A344471 Record values of A004016. %H A344471 Jianing Song, <a href="/A344471/b344471.txt">Table of n, a(n) for n = 1..247</a> %F A344471 a(n) = A004016(A230655(n)). %F A344471 a(n) = 6*A000005(A230655(n)) = 6*A002324(A230655(n)), n > 1. %e A344471 24 is a term because the circle with radius sqrt(91) centered at the origin hits exactly 24 points in the A_2 lattice, and any circle with radius < sqrt(91) centered at the origin hits fewer than 24 points. %o A344471 (PARI) my(v=list_A344473(10^15), rec=0); print1(1, ", "); for(n=1, #v, if(numdiv(v[n])>rec, rec=numdiv(v[n]); print1(6*rec, ", "))) \\ see program for A344473 %Y A344471 Cf. A230655, A004016, A002324, A344472, A000005, A344473. %Y A344471 Cf. A071385 (similar sequence). %K A344471 nonn %O A344471 1,2 %A A344471 _Jianing Song_, May 20 2021