OFFSET
1,2
COMMENTS
Indices k for which A218468(k)=k, where A218468(k) is the least unused number to be a multiple of one digit of the preceding term of that sequence.
Hans Havermann first stated that 2*10^k is such a fixed point, for all k >= 0. More subsequences have been given by Lars Blomberg, see link.
LINKS
Hans Havermann, Table of a218468(n) = n
L. Blomberg, H. Havermann et al., in reply to E. Angelini's OP, Re: a(n+1) is the multiple of at least one digit of a(n), SeqFan list, May 29 2013.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, May 30 2013
STATUS
approved