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A061580 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with four times its value. 0

%I

%S 1,4,16,424,16816,42432424,1681612816816,42432424483242432424,

%T 168161281681616321281681612816816,

%U 42432424483242432424424424128483242432424483242432424

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

%Y Cf. A061581-A061587.

%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 Natan Auel (auela(AT)reed.edu), May 15 2001

%E a(9) corrected by _N. J. A. Sloane_, Jan 23 2017 at the suggestion of Carolyn Liao.

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Last modified June 17 22:14 EDT 2021. Contains 345086 sequences. (Running on oeis4.)