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A201965 Primes of the form identical digits preceded by a 10. 1

%I

%S 101,103,107,109,1033,10111,10333,101111,103333,107777,10333333,

%T 101111111,103333333,1033333333,10999999999,101111111111,

%U 1099999999999,10333333333333,101111111111111111,1099999999999999999,10333333333333333333

%N Primes of the form identical digits preceded by a 10.

%H Vincenzo Librandi, <a href="/A201965/b201965.txt">Table of n, a(n) for n = 1..37</a>

%t Select[FromDigits/@Flatten[Table[PadRight[{10},i,#]&/@{1,2,3,4,5,6,7,8,9},{i,2,200}],1],PrimeQ[#]&]

%K nonn,base,less

%O 1,1

%A _Vincenzo Librandi_, Dec 10 2011

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Last modified September 22 20:09 EDT 2020. Contains 337291 sequences. (Running on oeis4.)