A123366 - OEIS

%I #2 Oct 01 2013 17:58:27

%S 1097,1099997,10999997,1099999997,1099999999999999999999997,

%T 10999999999999999999999997,

%U 1099999999999999999999999999999999999999997,10999999999999999999999999999999999999999999999999999999999999999997

%N Primes of the form 10*(10^(x+1)+10^x-1)+7.

%C 10(10^803+10^802-1)+7 is the largest PRP with less than 1000 digits.

%o (PARI) g(n) = for(x=1,n,y=10*(10^(x+1)+10^x-1)+7;if(ispseudoprime(y),print1(y",")))

%K nonn

%O 1,1

%A _Cino Hilliard_, Oct 12 2006