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A093948 Primes of the form 9*10^n - 1. 0

%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

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)