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 A046489 #17 Aug 11 2024 14:41:31 %S A046489 1,3,6,10,15,21,28,36,45,56,78,111,155,210,276,353,441,540,641,752, %T A046489 873,1004,1145,1296,1457,1628,1809,2000,2202,2414,2636,2868,3110,3362, %U A046489 3624,3896,4178,4470,4773,5086,5409,5742,6085,6438,6801,7174,7557,7950,8354 %N A046489 Sum of the first n palindromes (A002113). %H A046489 Harvey P. Dale, <a href="/A046489/b046489.txt">Table of n, a(n) for n = 0..1000</a> %H A046489 P. De Geest, <a href="https://www.worldofnumbers.com/index.html">World!Of Numbers</a> %t A046489 palQ[n_] := Reverse[x = IntegerDigits[n]] == x; Accumulate[Select[Range[410], palQ]] (* _Jayanta Basu_, Jun 26 2013 *) %Y A046489 Cf. A002113, A007504, A046485. %K A046489 nonn,base %O A046489 0,2 %A A046489 _Patrick De Geest_, Sep 15 1998