This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A047903 a(n+1) = a(n) * sum of digits of a(n). 2
 13, 52, 364, 4732, 75712, 1665664, 56632576, 2265303040, 56632576000, 2265303040000, 56632576000000, 2265303040000000, 56632576000000000, 2265303040000000000, 56632576000000000000, 2265303040000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS After the 7th element, every second element has the same beginning. a(9+2k) = 40 * a(8+2k) = 40 * 25 * a(7+2k) LINKS MAPLE P:=proc(n) local a, i, k, w; a:=13; 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 CROSSREFS Cf. A047892. Sequence in context: A022673 A152742 A213837 * A197790 A076163 A207977 Adjacent sequences:  A047900 A047901 A047902 * A047904 A047905 A047906 KEYWORD easy,nonn,base AUTHOR Miklos SZABO (mike(AT)ludens.elte.hu) STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .