A055003 - OEIS

%I #13 Aug 08 2017 10:58:27

%S 2,3,7,13,29,37,53,61,79,107,113,151,173,181,199,239,271,281,317,349,

%T 359,397,421,457,503,541,557,577,593,613,701,733,769,787,857,863,911,

%U 953,983,1021,1061,1069,1151,1163,1193,1213,1291,1399,1429

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

%p with(numtheory): [seq(ithprime(ithprime(i)-1),i=1..70)];

%o (PARI) a(n) = prime(prime(n)-1); \\ _Michel Marcus_, Aug 08 2017

%Y Cf. A000040, A008578.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Jun 10 2000