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 A332984 #12 Mar 09 2020 20:57:37 %S A332984 6,10,36,105,528,595,861,903,1081,1128,1225,1431,1711,2016,2211,2278, %T A332984 2415,2556,2926,3160,3403,3741,4005,4095,5050,5151,5253,6105,6441, %U A332984 6903,7750,8385,10011,11476,12720,14196,15400,15931,16836,17391,18528,19110 %N A332984 Triangular numbers also sum of two nonzero pentagonal numbers. %H A332984 Peter Kagey, <a href="/A332984/b332984.txt">Table of n, a(n) for n = 1..1000</a> %e A332984 6 = 1 + 5; %e A332984 10 = 5 + 5; %e A332984 36 = 1 + 35; %e A332984 105 = 35 + 70. %Y A332984 A subset of A000217 (triangular numbers) and of A332987 (sums of two nonzero pentagonal numbers). %Y A332984 Cf. A000326 (pentagonal numbers). %K A332984 nonn,easy %O A332984 1,1 %A A332984 _Olivier Gérard_, Mar 05 2020