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

%I #22 Mar 01 2022 11:21:28

%S 3,13,47,107,257,397,653,881,1279,1889,2293,3119,3847,4423,5323,6563,

%T 7937,8819,10391,11833,12889,14831,16477,18713,21599,23603,25189,

%U 27409,29063,31511,37159,39869,43321,45589,50923,53281,57271,61561,65173,69821,74383

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

%F a(n) = A000040(A033286(n)).

%e For n = 2, prime(2*prime(2)) = prime(2*3) = prime(6) = 13, so a(2) = 13.

%t Table[Prime[n*Prime[n]], {n, 100}] (* _T. D. Noe_, Oct 22 2013 *)

%o (PARI) a(n) = prime(n*prime(n)); \\ _Michel Marcus_, Oct 22 2013

%Y Cf. A000040, A006450, A033286, A036689, A080697, A217622, A230098, A230325, A230285, A230460.

%K nonn

%O 1,1

%A _Omar E. Pol_, Oct 20 2013