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

%I #16 Dec 28 2023 23:35:13

%S 19,59,101,149,193,241,293,353,409,461,521,587,641,691,757,823,881,

%T 947,1013,1063,1123,1201,1277,1319,1423,1471,1531,1597,1657,1723,1789,

%U 1873,1949,2011,2083,2141,2237,2293,2357,2417,2503,2591,2663

%N a(n) = prime(9n-1).

%H Ivan Panchenko, <a href="/A031375/b031375.txt">Table of n, a(n) for n = 1..1000</a>

%t Prime[9*Range[50]-1] (* _Harvey P. Dale_, Aug 19 2020 *)

%o (Magma) [ NthPrime(9*n-1): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 08 2011

%Y Cf. A000040, A017257.

%K nonn

%O 1,1

%A _Jeff Burch_