A226843 - OEIS

%I #22 Nov 13 2016 17:03:50

%S 2,5,11,23,31,47,59,73,103,109,149,167,179,197,233,269,277,313,347,

%T 353,389,419,449,499,523,547,571,587,607,691,727,761,773,853,859,907,

%U 947,977,1019,1051,1063,1129,1153,1187,1201,1289,1381,1427,1433,1453,1489

%N a(n) = prime(prime(n + 1) - 2).

%e a(5) = 31 since the (5 + 1)-th prime is 13, and the (13 - 2)-th prime is 31.

%t Table[Prime[Prime[n] - 2], {n, 2, 75}] (* _Alonso del Arte_, Jun 21 2013 *)

%o (PARI) a(n) = prime(prime(n + 1) - 2); \\ _Michel Marcus_, Nov 13 2016

%Y Cf. A158611, A006450.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Jun 19 2013