%I
%S 89,8999,89999999,89999999999999999999,899999999999999999999999999999,
%T 89999999999999999999999999999999999999,
%U 8999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
%N Primes of the form 9*10^n  1.
%C Equivalently, primes of the form 8*10^n + 9*R_n, where R_n is the repunit (A002275) of length n.
%H Makoto Kamada, <a href="https://stdkmd.net/nrr/8/89999.htm#prime">Prime numbers of the form 899...999</a>.
%H <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>
%Y Cf. A056725 (corresponding n).
%K nonn
%O 1,1
%A _Rick L. Shepherd_, Apr 17 2004
