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Near-repdigit primes with at least two 9's as the repeated digit.
9

%I #14 Sep 11 2023 11:52:39

%S 991,997,99991,9999991,99999999999999997,

%T 999999999999999999999999999999991,

%U 999999999999999999999999999999999999999999991

%N Near-repdigit primes with at least two 9's as the repeated digit.

%H Robert Price, <a href="/A365598/b365598.txt">Table of n, a(n) for n = 1..14</a>

%e 99991 is a term because all digits are equal to 9 except the last one.

%Y Cf. A105976, A105978, A105979, A105980, A105982, A365592, A365596, A365597, A365598.

%K base,nonn

%O 1,1

%A _Robert Price_, Sep 10 2023