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%I #16 Jan 22 2023 07:26:02
%S 2,3,5,7,11,1111111111111111111,11111111111111111111111
%N Primes with only one distinct decimal digit. Also called repunit primes or repdigit primes.
%C Primes in A010785 (repdigit numbers). Union of single-digit primes and A004022 (repunit primes). A004023 shows that the next term has 317 1's. The Mersenne primes (A000668) are the binary analog (i.e., bits are all 1's).
%D Clifford A. Pickover, A Passion for Mathematics (2005) at 60, 297.
%Y A004022 is a subsequence.
%Y Cf. A004023, A010785, A000668.
%Y A subsequence of A055387, but not of A225053.
%K base,easy,nonn
%O 1,1
%A _Rick L. Shepherd_, Feb 22 2006
%E Reference provided by _Harvey P. Dale_, Apr 19 2014
%E Definition expanded by _N. J. A. Sloane_, Jan 22 2023
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