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 A053779 #15 Aug 11 2024 14:41:32 %S A053779 1,22,24,167,202,226,1443,2380,3190,3952,4220,16827,26304,37612,40813, %T A053779 213501,376524,1920079,2061085,2635057,3463613,4268588,16513206, %U A053779 68101132,166428703,207224360,403784450,421279478,1384813481 %N A053779 Numbers k such that the sum of the first k composite numbers is palindromic. %C A053779 Sequence lists numbers k such that 4 + 6 + 8 + 9 + 10 + 12 + ... + composite(k) is palindromic. For the corresponding values of composite(k) see A057959. %H A053779 P. De Geest, <a href="https://www.worldofnumbers.com/firstpal.htm#sfn3">Palindromic Sums</a> %H A053779 C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_089.htm">PrimePuzzle 89</a> %t A053779 Position[Accumulate[Select[Range[146*10^7],CompositeQ]],_?(PalindromeQ[ #] &)] // Flatten (* _Harvey P. Dale_, Sep 29 2018 *) %Y A053779 Cf. A002808, A002113, A053780. %K A053779 base,nonn %O A053779 1,2 %A A053779 _G. L. Honaker, Jr._, Mar 29 2000 %E A053779 More terms from _G. L. Honaker, Jr._, Mar 29 2000 %E A053779 Further terms added by _Patrick De Geest_, Nov 15 2000