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a(n) = prime(10*n - 1).
1

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

%S 23,67,109,167,227,277,347,401,461,523,599,653,727,797,859,937,1009,

%T 1063,1129,1217,1289,1367,1447,1499,1579,1637,1723,1801,1879,1979,

%U 2039,2113,2207,2281,2351,2417,2521,2609,2683,2731,2803,2897,2971

%N a(n) = prime(10*n - 1).

%H Ivan Panchenko, <a href="/A031376/b031376.txt">Table of n, a(n) for n = 1..1000</a>

%o (Magma) [ NthPrime(10*n-1): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 08 2011

%K nonn

%O 1,1

%A _Jeff Burch_