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 A061587 #13 Oct 27 2023 22:05:38
%S A061587 1,9,81,729,631881,5427972729,45361863816318631881,
%T A061587 36452754972542772954279725427972729,
%U A061587 2754364518634536816318453618636318814536186381631845361863816318631881
%N A061587 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with nine times its value.
%C A061587 Each of the subsequences a(9n), a(9n-1), ..., and a(9n-8) converges to a different limit, if we consider the numbers as sequences of digits. - _M. F. Hasler_, Jun 24 2016
%H A061587 Indranil Ghosh, <a href="/A061587/b061587.txt">Table of n, a(n) for n = 1..13</a>
%o A061587 (PARI) A061587(n=2,a=1,m=9)={while(n--,a=eval(concat(apply(t->Str(t),digits(a)*m))));a} \\ If only the 2nd argument is given, then the operation is applied once to that argument. - _M. F. Hasler_, Jun 24 2016
%Y A061587 Cf. A061581 - A061586, A061511-A061522, A061746-A061750.
%K A061587 nonn,base,easy
%O A061587 1,2
%A A061587 _Amarnath Murthy_, May 13 2001
%E A061587 More terms from Larry Reeves (larryr(AT)acm.org) and _Asher Auel_, May 15 2001