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%I #17 Sep 08 2022 08:45:53
%S 2,47,4999999999999997,499999999999999999999999999999999999999997,
%T 49999999999999999999999999999999999999999999999999999999999999997
%N Primes of the form 5*10^n - 3.
%C The next term has 132 digits. - _Harvey P. Dale_, Jun 29 2011
%t Join[{2},Select[10#+7&/@(FromDigits/@Table[PadRight[{4,9},n,9],{n,150}]), PrimeQ]] (* _Harvey P. Dale_, Jun 29 2011 *)
%o (Magma) [a: n in [0..250] | IsPrime(a) where a is 5*10^n-3];
%Y Cf. A103003.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Dec 10 2010
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