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 A047897 a(1) = 5; for n > 0, a(n+1) = a(n) * sum of digits of a(n). 11
 5, 25, 175, 2275, 36400, 473200, 7571200, 166566400, 5663257600, 226530304000, 5663257600000, 226530304000000, 5663257600000000, 226530304000000000, 5663257600000000000, 226530304000000000000, 5663257600000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS After a(9), every second element has the same beginning. a(11+2k) = 40 * a(10+2k) = 40 * 25 * a(9+2k). 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:=5; 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 MATHEMATICA NestList[#*Total[IntegerDigits[#]]&, 5, 20] (* Harvey P. Dale, Jan 25 2014 *) PROG (Haskell) a047897 n = a047897_list !! (n-1) a047897_list = iterate a057147 5 -- Reinhard Zumkeller, Mar 19 2014 CROSSREFS Cf. A047892 (start=2), A047912 (start=3), A047898 (start=6), A047899 (start=7), A047900 (start=8), A047901 (start=9), A047902 (start=11). Sequence in context: A258369 A137383 A049035 * A204461 A121144 A096684 Adjacent sequences: A047894 A047895 A047896 * A047898 A047899 A047900 KEYWORD easy,nonn,base AUTHOR Miklos SZABO (mike(AT)ludens.elte.hu) STATUS approved

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Last modified June 9 23:27 EDT 2023. Contains 363183 sequences. (Running on oeis4.)