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a(n) = prime(9*n - 3).
1

%I #14 Sep 08 2022 08:44:50

%S 13,47,89,137,181,233,281,347,397,449,503,571,619,677,743,811,863,937,

%T 997,1051,1109,1187,1249,1303,1399,1453,1511,1579,1627,1709,1783,1867,

%U 1931,1999,2069,2131,2213,2281,2347,2399,2473,2557,2657

%N a(n) = prime(9*n - 3).

%H Ivan Panchenko, <a href="/A031390/b031390.txt">Table of n, a(n) for n = 1..1000</a>

%t Prime[9*Range[50]-3] (* _Harvey P. Dale_, Jul 25 2016 *)

%o (Magma) [ NthPrime(9*n-3): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 09 2011

%K nonn

%O 1,1

%A _Jeff Burch_