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 A115895 #7 Jul 15 2021 21:23:45 %S A115895 1,2,3,4,5,9,34,64,81,128,141,148,151,161,162,170,181,191,196,198,219, %T A115895 236,249,256,257,260,277,282,297,315,322,326,327,334,346,353,355,358, %U A115895 373,375,377,383,387,415,473,479,499,714,793,1225,1316,1420,1517,1593 %N A115895 Numbers k such that k + sigma(k) is a palindrome. %H A115895 Harvey P. Dale, <a href="/A115895/b115895.txt">Table of n, a(n) for n = 1..1000</a> %e A115895 128 + sigma(128) = 128 + 255 = 383. %t A115895 Select[Range[1600],PalindromeQ[#+DivisorSigma[1,#]]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 29 2017 *) %Y A115895 Cf. A115890, A115896, A115897. %K A115895 nonn,base %O A115895 1,2 %A A115895 _Giovanni Resta_, Feb 06 2006