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 A047901 a(1) = 9; a(n+1) = a(n) * sum of decimal digits of a(n). 9
 9, 81, 729, 13122, 118098, 3188646, 114791256, 4132485216, 148769467776, 10711401679872, 578415690713088, 41645929731342336, 2998506940656648192, 296852187125008171008, 24045027157125661851648, 2164052444141309566648320 (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 PROG (Haskell) a047901 n = a047901_list !! (n-1) a047901_list = iterate a057147 9  -- Reinhard Zumkeller, Mar 19 2014 (Python) A047901_list, l = [9], 9 for _ in range(10**2): ....l *= sum(int(d) for d in str(l)) ....A047901_list.append(l) # Chai Wah Wu, Jan 04 2015 CROSSREFS Cf. A047892 (start=2), A047912 (start=3), A047897 (start=5), A047898 (start=6), A047899 (start=7), A047900 (start=8), A047902 (start=11). Sequence in context: A050739 A240945 A158779 * A061587 A033145 A158762 Adjacent sequences:  A047898 A047899 A047900 * A047902 A047903 A047904 KEYWORD easy,nonn,base AUTHOR Miklos SZABO (mike(AT)ludens.elte.hu) EXTENSIONS Edited by Charles R Greathouse IV, Aug 02 2010 STATUS approved

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Last modified May 13 22:47 EDT 2021. Contains 343868 sequences. (Running on oeis4.)