A061587 - OEIS

%I #13 Oct 27 2023 22:05:38

%S 1,9,81,729,631881,5427972729,45361863816318631881,

%T 36452754972542772954279725427972729,

%U 2754364518634536816318453618636318814536186381631845361863816318631881

%N a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with nine times its value.

%C 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 Indranil Ghosh, <a href="/A061587/b061587.txt">Table of n, a(n) for n = 1..13</a>

%o (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 Cf. A061581 - A061586, A061511-A061522, A061746-A061750.

%K nonn,base,easy

%O 1,2

%A _Amarnath Murthy_, May 13 2001

%E More terms from Larry Reeves (larryr(AT)acm.org) and _Asher Auel_, May 15 2001