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%I #9 Jan 08 2018 01:58:29
%S 1,9,4,5,6,7,8,17,19,11,12,13,14,29,31,17,18,19,20,41,43,23,24,73,101,
%T 53,109,29,30,31,32,97,67,103,71,37,38,191,79,41,42,43,44,89,181,47,
%U 48,97,197,101,103,53,54,109,331,113,229,59,60,61
%N a(1) = 1. Smallest prime == 1 (mod n) if n is composite else least composite number ==1 (mod n).
%o (PARI) a(n) = {if (n == 1, return (1)); k = 1; if (! isprime(n), while (! isprime(k*n+1), k++), while (isprime(k*n+1), k++)); k*n+1;} \\ _Michel Marcus_, Sep 17 2013
%K nonn,less
%O 1,2
%A _Amarnath Murthy_, Nov 15 2005
%E a(3) corrected and more terms added by _Michel Marcus_, Sep 17 2013
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