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A177440 Primes of the form (8*10^n + 7)/3. 1

%I

%S 5,29,269,26669,26666669,266666666666669,266666666666666666669,

%T 2666666666666666666666666666666666666669

%N Primes of the form (8*10^n + 7)/3.

%C a(12) has 1191 digits. - _Vincenzo Librandi_, Jan 03 2014

%H Vincenzo Librandi, <a href="/A177440/b177440.txt">Table of n, a(n) for n = 1..11</a>

%t Select[Table[(8 10^n + 7)/3, {n, 0, 300}], PrimeQ] (* _Vincenzo Librandi_, Jan 03 2014 *)

%o (MAGMA) [a: n in [0..250] | IsPrime(a) where a is (8*10^n+7)div(3)]

%Y Cf. A102957.

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Dec 11 2010

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Last modified September 21 05:02 EDT 2021. Contains 347596 sequences. (Running on oeis4.)