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%I #12 Sep 08 2022 08:45:53
%S 2,43,45553,45555553,45555555555555555553,
%T 45555555555555555555555555555555553,
%U 4555555555555555555555555555555555555555555555555555553
%N Primes of the form (41*10^n-23)/9.
%t Select[(41 10^Range[0,60]-23)/9,PrimeQ] (* _Harvey P. Dale_, Dec 12 2020 *)
%o (Magma) [a: n in [0..250] | IsPrime(a) where a is (41*10^n-23)div(9)]
%Y Cf. A102991.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Dec 11 2010