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A036447 Double and reverse digits. 3
1, 2, 4, 8, 61, 221, 244, 884, 8671, 24371, 24784, 86594, 881371, 2472671, 2435494, 8890784, 86518771, 245730371, 247064194, 883821494, 8892467671, 24353948771, 24579870784, 86514795194, 883095920371, 2470481916671, 2433383690494 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Nick Hobson, Python program for this sequence

FORMULA

a(n+1) = A004093(a(n)). - Reinhard Zumkeller, Feb 09 2012

MATHEMATICA

NestList[ FromDigits[ Reverse[ IntegerDigits[ 2# ] ] ] &, 1, 27 ]

NestList[IntegerReverse[2#]&, 1, 30] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 18 2017 *)

PROG

(Haskell)

a036447 n = a036447_list !! n

a036447_list = iterate a004093 1  -- Reinhard Zumkeller, Feb 09 2012

CROSSREFS

Cf. A004086, A004093.

Sequence in context: A004094 A028910 A018482 * A263451 A069027 A065549

Adjacent sequences:  A036444 A036445 A036446 * A036448 A036449 A036450

KEYWORD

nonn,base,easy,nice

AUTHOR

Rodolfo Kurchan

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Mar 31 2000

STATUS

approved

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Last modified November 14 09:49 EST 2018. Contains 317182 sequences. (Running on oeis4.)