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%I #12 Jul 14 2021 12:41:29
%S 2,3,4,7,6,7,10,9,12,13,18,13,24,15,16,21,18,21,22,2,22,28,26,25,28,
%T 33,28,34,32,33,36,36,34,37,42,43,40,39,48,43,42,46,46,47,48,51,50,54,
%U 52,51,56,55,56,55,58,60,58,61,60,67,66,63,66,67,68,67,70,75,70,79,72,79
%N a(n) is the smallest k > n such that n*k+1 is prime.
%e a(1)=2 because 1*2+1=3 is the smallest prime of the form 1*k+1 with k > 1.
%e a(4)=7 because 4*7+1=29 is the smallest prime of the form 4*k+1 with k > 4.
%e a(100)=103 because 100*103+1=10301 is the smallest prime of the form 100*k+1 with k > 100.
%K nonn
%O 1,1
%A _Zak Seidov_, Sep 10 2002
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