OFFSET
1,1
COMMENTS
The "waterfall" sequence S for a given starting value S(1)>9 is defined as S(n)=d(n)*d(n-1) (n>1), where d(n) is the n-th digit of the sequence.
Initial values having a digit 0 or 5 are likely to end in repeating zeros, which motivates the definition of this sequence. See A210652 for further information.
PROG
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Mar 27 2012
STATUS
approved