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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
1, 4, 16, 424, 16816, 42432424, 1681612816816, 42432424483242432424, 168161281681616321281681612816816, 42432424483242432424424424128483242432424483242432424 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Cf. A061581-A061587.

Sequence in context: A067211 A156337 A000874 * A037976 A013138 A262546

Adjacent sequences:  A061577 A061578 A061579 * A061581 A061582 A061583

KEYWORD

nonn,base,easy

AUTHOR

Amarnath Murthy, May 13 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org) and Asher Natan Auel (auela(AT)reed.edu), May 15 2001

a(9) corrected by N. J. A. Sloane, Jan 23 2017 at the suggestion of Carolyn Liao.

STATUS

approved

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Last modified May 17 06:30 EDT 2021. Contains 343965 sequences. (Running on oeis4.)