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 A061888 #20 Apr 03 2023 10:36:10 %S A061888 10,5063,14573,17098,1916357,468726713734 %N A061888 Numbers k such that k^2 is the sum of the first m primes for some m. %H A061888 G. L. Honaker Jr. and C. Caldwell, <a href="https://t5k.org/curios/page.php?curio_id=179">Prime Curios!: 9</a> %H A061888 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_009.htm">Problem 9: Sum of first k primes is perfect square</a>, The Prime Puzzles and Problems Connection. %F A061888 a(n)^2 = A061890(n). %e A061888 10^2 = 2+3+5+7+11+13+17+19+23, so 10 is in the sequence. %Y A061888 Cf. A033997, A033998, A061890. %K A061888 nonn,hard,more %O A061888 1,1 %A A061888 _David W. Wilson_, May 12 2001 %E A061888 a(6) from _Giovanni Resta_, May 27 2003 %E A061888 Edited by _Ray Chandler_, Mar 20 2007