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A201966 Primes of the form identical digits preceded by an 11. 1

%I

%S 11,113,11777,1133333,1199999,113333333,11777777777,

%T 1111111111111111111,11111111111111111111111,

%U 1177777777777777777777777,113333333333333333333333333,1177777777777777777777777777777777777777777777777

%N Primes of the form identical digits preceded by an 11.

%H Vincenzo Librandi, <a href="/A201966/b201966.txt">Table of n, a(n) for n = 1..16</a>

%t Select[FromDigits/@Flatten[Table[PadRight[{11},i,#]&/@{1,2,3,4,5,6,7,8,9},{i,2,1200}],1],PrimeQ[#]&]

%K nonn,base,less

%O 1,1

%A _Vincenzo Librandi_, Dec 10 2011

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)