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Near-repdigit primes with at least two 7's as the repeated digit.
9

%I #14 Sep 11 2023 11:53:02

%S 773,77773,777777773,777777777773,7777777777771,777777777777773,

%T 77777777777777777771,777777777777777777773,77777777777777777777771,

%U 7777777777777777777777777777771

%N Near-repdigit primes with at least two 7's as the repeated digit.

%H Robert Price, <a href="/A365597/b365597.txt">Table of n, a(n) for n = 1..20</a>

%e 77773 is a term because all digits are equal to 7 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