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 A054267 #5 Oct 27 2019 00:09:48 %S A054267 109,193,509,661,1439,3433,3889,3967,4549,6661,7001,8467,10099,17203, %T A054267 18583,24847,25117,26497,29587,30497,31307,47569,47869,49789,53939, %U A054267 54139,66361,67061,70901,71011,102199,132229,158269,171179,185699 %N A054267 Sum of composite numbers between prime p and nextprime(p) is palindromic with restriction 'p + 1 <> sum'. %e A054267 a(4)=661 since between 661 and next prime 673 we get the palindromic sum 662 + 663 + 664 + 665 + 666 + 667 + 668 + 669 + 670 + 671 + 672 = 7337. %Y A054267 Cf. A046933, A054264, A054265, A054266, A054268. %K A054267 nonn,base %O A054267 0,1 %A A054267 _Patrick De Geest_, Apr 15 2000