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 A284377 #43 Feb 16 2025 08:33:43 %S A284377 1,116,11681,11681256,11681256625,116812566251296,1168125662512962401, %T A284377 11681256625129624014096,116812566251296240140966561, %U A284377 11681256625129624014096656110000,1168125662512962401409665611000014641,116812566251296240140966561100001464120736 %N A284377 Concatenation of the first n positive 4th powers. %H A284377 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a> %o A284377 (PARI) a(n) = my(s=""); for (k=1, n, s = concat(s, Str(k^4))); eval(s); \\ _Michel Marcus_, Dec 30 2022 %Y A284377 Cf. A007908, A019521, A019522, A359403. %K A284377 base,nonn,easy %O A284377 1,2 %A A284377 _XU Pingya_, Mar 25 2017 %E A284377 a(8) corrected by _Georg Fischer_, Dec 30 2022