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%I #18 Jan 02 2023 12:30:49
%S 1,2,10,19,20,34,51,127,128,129,130,131,132,133,134,135,136,137,138,
%T 139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,
%U 156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187
%N Fixed points of A218468 (= least unused number which is a multiple of a digit of the preceding term).
%C 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.
%C _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.
%H Hans Havermann, <a href="http://chesswanks.com/seq/a218468(n)=n.txt">Table of a218468(n) = n</a>
%H L. Blomberg, H. Havermann et al., in reply to E. Angelini's OP, <a href="http://list.seqfan.eu/oldermail/seqfan/2013-May/011228.html">Re: a(n+1) is the multiple of at least one digit of a(n)</a>, SeqFan list, May 29 2013.
%Y Cf. A218468.
%K nonn,base
%O 1,2
%A _M. F. Hasler_, May 30 2013
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