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a(n) = prime(9*n-7).
3

%I #17 Feb 18 2024 01:36:04

%S 3,31,71,109,163,211,263,313,373,431,479,547,601,653,719,773,839,907,

%T 971,1031,1091,1153,1223,1289,1361,1433,1487,1553,1609,1669,1747,1823,

%U 1889,1979,2029,2099,2161,2251,2311,2381,2441,2539,2617

%N a(n) = prime(9*n-7).

%H Ivan Panchenko, <a href="/A031916/b031916.txt">Table of n, a(n) for n = 1..1000</a>

%t Prime[9*Range[60]-7] (* _G. C. Greubel_, Feb 18 2024 *)

%o (Magma) [ NthPrime(9*n-7): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 09 2011

%o (SageMath) [nth_prime(9*n-7) for n in range(1,61)] # _G. C. Greubel_, Feb 18 2024

%Y Cf. A000040, A031915, A031917.

%K nonn

%O 1,1

%A _Jeff Burch_