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

%I #20 Sep 08 2022 08:44:50

%S 23,61,103,151,197,251,307,359,419,463,523,593,643,701,761,827,883,

%T 953,1019,1069,1129,1213,1279,1321,1427,1481,1543,1601,1663,1733,1801,

%U 1877,1951,2017,2087,2143,2239,2297,2371,2423,2521,2593

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

%H Jens Kruse Andersen, <a href="/A031342/b031342.txt">Table of n, a(n) for n = 1..10000</a>

%p ithprime(9*n)

%t Prime[9*Range[50]] (* _Harvey P. Dale_, Mar 17 2022 *)

%o (Magma) [NthPrime(9*n): n in [1..50]]; // _Vincenzo Librandi_, Apr 08 2011

%o (Sage) [nth_prime(9*n) for n in (1..50)] # _Bruno Berselli_, May 07 2014

%o (PARI) a(n)=prime(9*n) \\ _Edward Jiang_, Sep 08 2014

%Y Cf. similar sequences listed in A031336.

%K nonn

%O 1,1

%A _Jeff Burch_