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A177508 Primes of the form 2*10^n-7. 0

%I

%S 13,193,1993,19993,1999993,19999999999999993,1999999999999999999993,

%T 19999999999999999999999999993,

%U 1999999999999999999999999999999999999999999999993,19999999999999999999999999999999999999999999999999999999999999999999999999999999993

%N Primes of the form 2*10^n-7.

%t Select[2*10^Range[100]-7, PrimeQ] (* _Harvey P. Dale_, Jan 27 2015 *)

%o (MAGMA)[a: n in [1..250]|IsPrime(a) where a is (2*10^n-7)]

%Y Cf. A102946.

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Dec 11 2010

%E One more term (a(10)) from _Harvey P. Dale_, Jan 27 2015

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Last modified February 21 03:02 EST 2020. Contains 332086 sequences. (Running on oeis4.)