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%I #12 Sep 08 2022 08:45:53
%S 53,503,5003,500000003,5000000000000000003,500000000000000000003,
%T 50000000000000000000000000000003,
%U 5000000000000000000000000000000000000000003
%N Primes of the form (5*10^n+3).
%H Vincenzo Librandi, <a href="/A177120/b177120.txt">Table of n, a(n) for n = 1..13</a>
%H Makoto Kamada, <a href="https://stdkmd.net/nrr/5/50003.htm#prime">Prime numbers of the form 500...003</a>.
%t Select[5 10^Range[80] + 3, PrimeQ] (* _Vincenzo Librandi_, May 11 2013 *)
%o (Magma)[ a: n in [0..250]|IsPrime(a) where a is 5*10^n+3]
%Y Cf. A096254.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Dec 10 2010
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