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Least n-Ramanujan prime.
6

%I #22 Jun 09 2013 13:50:15

%S 2,2,11,41,569,1367

%N Least n-Ramanujan prime.

%C We define the 0-Ramanujan primes to be the usual primes (A000040), and we define the 1-Ramanujan primes to be the Ramanujan primes (A104272).

%C The sequence is only conjectural without a proof of an upper bound on a(n) (like the bound A104272(n) < prime(3*n) proved by Laishram and used in computing Ramanujan primes). - _Jonathan Sondow_, Aug 27 2011

%Y Cf. A104272 (Ramanujan primes), A192820 (2-Ramanujan primes), A192821 (3-Ramanujan primes), A192822 (4-Ramanujan primes), A192823 (5-Ramanujan primes), A225907 (least n-Ramanujan prime less than half the next n-Ramanujan prime, or 0 if none).

%K nonn,more

%O 0,1

%A _T. D. Noe_, Jul 11 2011