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 A183224 #13 Oct 07 2024 01:18:08
%S A183224 2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,
%T A183224 28,29,30,31,32,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
%U A183224 52,53,54,55,56,57,58,59,60,61,62,63,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101
%N A183224 Complement of the 12-gonal numbers.
%F A183224 a(n) = n + floor(1/2+(n/5+1/5)^(1/2)).
%t A183224 Table[n+Floor[1/2+(n/5+1/5)^(1/2)], {n,100}]
%o A183224 (Python)
%o A183224 from math import isqrt
%o A183224 def A183224(n): return n+(isqrt((n<<2|2)//5)+1>>1) # _Chai Wah Wu_, Oct 06 2024
%Y A183224 Cf. A051624 (12-gonal numbers.)
%K A183224 nonn
%O A183224 1,1
%A A183224 _Clark Kimberling_, Jan 01 2011