cp's OEIS Frontend

A061584 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with six times its value.

%I A061584 #16 Oct 27 2023 22:05:37
%S A061584 1,6,36,1836,6481836,3624486481836,1836122424483624486481836,
%T A061584 64818366121224122424481836122424483624486481836,
%U A061584 362448648183636612612122461212241224244864818366121224122424481836122424483624486481836
%N A061584 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with six times its value.
%C A061584 a(n) contains all of a(n-1) as its least significant digits.
%H A061584 John Cerkan, <a href="/A061584/b061584.txt">Table of n, a(n) for n = 1..13</a>
%t A061584 NestList[FromDigits[Flatten[IntegerDigits/@(6 IntegerDigits[#])]]&,1,10] (* _Harvey P. Dale_, Aug 26 2022 *)
%o A061584 (Python)
%o A061584 def A061584_first(n):
%o A061584     an = "1"
%o A061584     a061584 = []
%o A061584     while n > 1:
%o A061584         a061584.append(int(an))
%o A061584         newan = ""
%o A061584         for i in an:
%o A061584             newan += str(6*int(i))
%o A061584         an = newan
%o A061584         n -= 1
%o A061584     a061584.append(int(an))
%o A061584     return a061584 # _John Cerkan_, May 25 2018
%Y A061584 Cf. A061581, A061582, A061583, A061585, A061586, A061587, A061533.
%K A061584 nonn,base,easy
%O A061584 1,2
%A A061584 _Amarnath Murthy_, May 13 2001
%E A061584 More terms from Larry Reeves (larryr(AT)acm.org) and _Asher Auel_, May 15 2001