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 A363768 #7 Jun 25 2023 08:11:04 %S A363768 3,4,5,6,7,8,9,10,11,12,13,14,16,17,18,19,20,22,23,24,25,26,27,28,30, %T A363768 32,33,34,36,38,40,41,42,43,44,45,46,48,54,58,60,62,63,64,65,66,68,69, %U A363768 70,71,72,74,76,78,80,82,84,86,88,94,96,98,102,108,114,118,120,126,128,138,144 %N A363768 The values k such that a regular k-gon with all diagonals drawn contains more 3-sided cells than 4-sided cells. %C A363768 It is extremely likely that the terms in the data section form the complete list of such k-gons, although this is unknown. If more terms do exist they are greater than 875. %C A363768 The only known k-gon where the number of 3-sided and 4-sided cells is equal is the 39-gon. %H A363768 Scott R. Shannon, <a href="/A363768/a363768.jpg">Image of the 6-gon</a>. This is the first k-gon to contain both 3 and 4 sided cells and where there are more 3-sided cells than 4-sided cells. %H A363768 Scott R. Shannon, <a href="/A363768/a363768_1.jpg">Image of the 15-gon</a>. This is the first k-gon that contains more 4-sided cells than 3-sided cells. %H A363768 Scott R. Shannon, <a href="/A363768/a363768_2.jpg">Image of the 39-gon</a>. This is the only known k-gon that contains the same number of 3 and 4 sided cells. It is likely to be the only such k-gon. %e A363768 6 is a term as a regular 6-gon with all diagonals drawn contains 18 3-sided cells and 6 4-sided cells. %e A363768 144 is a term as a regular 144-gon with all diagonals drawn contains 6363936 3-sided cells and 6270048 4-sided cells. This is likely the last such k-gon. %Y A363768 Cf. A331450, A349549, A007678. %K A363768 nonn %O A363768 1,1 %A A363768 _Scott R. Shannon_, Jun 21 2023