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%I #4 May 22 2017 11:56:40
%S 1,4,5,17,20,28,173,181,331,575,1313,1754,4067,27314
%N Numbers n such that (n+1)*10^n - 1 is prime.
%C The corresponding primes are in A145851. Primes found and proved by PrimeForm. No more terms up to 30000.
%o (PARI) is(n)=ispseudoprime((n+1)*10^n-1) \\ _Charles R Greathouse IV_, May 22 2017
%Y Cf. A145851.
%K nonn
%O 1,2
%A _Rick L. Shepherd_, Mar 22 2010