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 A053062 #20 Jul 02 2025 16:01:59
%S A053062 1,24,369,481216,510152025,61218243036,7142128354249,816243240485664,
%T A053062 91827364554637281,102030405060708090100,112233445566778899110121,
%U A053062 1224364860728496108120132144,13263952657891104117130143156169,14284256708498112126140154168182196
%N A053062 Concatenate n, 2n, 3n, ... nn.
%D A053062 Felice Russo, A set of new Smarandache functions, sequences and conjectures in number theory, American Research Press 2000.
%p A053062 a:= n-> parse(cat(j*n$j=1..n)):
%p A053062 seq(a(n), n=1..14); # _Alois P. Heinz_, Jan 24 2021
%o A053062 (Python)
%o A053062 def a(n): return int("".join(str(n*i) for i in range(1, n+1)))
%o A053062 print([a(n) for n in range(1, 15)]) # _Michael S. Branicky_, Jan 24 2021
%Y A053062 Cf. A061082.
%K A053062 easy,base,nonn,less
%O A053062 1,2
%A A053062 _Felice Russo_, Feb 25 2000
%E A053062 More terms from _James Sellers_, Feb 28 2000