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A047902 a(1) = 11; for n > 0, a(n+1) = a(n) * sum of digits of a(n). 11
11, 22, 88, 1408, 18304, 292864, 9078784, 390387712, 15615508480, 671466864640, 38945078149120, 2375649767096320, 180549382299320320, 12638456760952422400, 960522713832384102400, 67236589968266887168000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..250

FORMULA

a(n+1) = A057147(a(n)). - Reinhard Zumkeller, Mar 19 2014

MAPLE

P:=proc(n) local a, i, k, w; a:=11; print(a); for i from 1 by 1 to n do w:=0; k:=a; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; a:=a*w; print(a); od; end: P(1000); # Paolo P. Lava, Apr 27 2007

PROG

(Haskell)

a047902 n = a047902_list !! (n-1)

a047902_list = iterate a057147 11  -- Reinhard Zumkeller, Mar 19 2014

CROSSREFS

Cf. A047892 (start=2), A047912 (start=3), A047897 (start=5), A047898 (start=6), A047899 (start=7), A047900 (start=8), A047901 (start=9).

Sequence in context: A109687 A225361 A111696 * A081930 A143964 A034708

Adjacent sequences:  A047899 A047900 A047901 * A047903 A047904 A047905

KEYWORD

easy,nonn,base

AUTHOR

Miklos SZABO (mike(AT)ludens.elte.hu)

STATUS

approved

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Last modified June 22 03:15 EDT 2021. Contains 345367 sequences. (Running on oeis4.)