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%I #10 Mar 30 2012 17:27:06
%S 3,5,5,4259,25409,25409,512819,512819,17733438029,1095010766849,
%T 766405913232959
%N Smallest prime p such that k*p + k + 1 is prime for k=1..n.
%e n=1: p=3 and p+2=5 both primes
%e n=2,3: p=5, p+2=7, 2*p+3=13, and 3*p+4=19 all four primes
%e n=4: p=4259, p+2=4261, 2*p+3=8521, 3*p+4=12781, and 4*p+5=17041 all five primes.
%K nonn,more,hard
%O 1,1
%A _Zak Seidov_, Mar 01 2011
%E a(10), a(11) from _Max Alekseyev_, Mar 10 2011
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