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A061586 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with eight times its value. 5
1, 8, 64, 4832, 32642416, 241648321632848, 1632848326424168482416643264, 84824166432642416483216328486432641632848483224164832, 64326416328484832241648321632848326424168482416643264483224164832848241664326432642416163284832642416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

John Cerkan, Table of n, a(n) for n = 1..12

MATHEMATICA

NestList[FromDigits[Flatten[IntegerDigits/@(8*IntegerDigits[#])]]&, 1, 10] (* Harvey P. Dale, Sep 22 2012 *)

PROG

(Python)

def A061586_first(n):

    an = "1"

    cnt = 1

    a061586 = []

    while cnt < n:

        a061586.append(int(an))

        newan = ""

        for i in an:

            newan += str(8*int(i))

        an = newan

        cnt += 1

    a061586.append(int(an))

    return a061586 # John Cerkan, May 25 2018

CROSSREFS

Cf. A061581-A061587.

Sequence in context: A154710 A069033 A087337 * A132545 A034376 A202783

Adjacent sequences:  A061583 A061584 A061585 * A061587 A061588 A061589

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

STATUS

approved

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Last modified July 29 22:13 EDT 2021. Contains 346346 sequences. (Running on oeis4.)