%I #10 Oct 01 2012 18:56:55
%S 2,2,3,3,5,5,5,5,7,7,11,11,11,11,13,13,17,17,17,17,19,19,19,19,19,19,
%T 23,23,29,29,29,29,29,29,31,31,31,31,37,37,41,41,41,41,43,43,43,43,43,
%U 43,47,47,47,47,47,47,53,53,59,59,59,59,59,59,61,61,61,61,67,67,71,71
%N Largest prime < largest prime < n.
%p [ seq(prevprime(prevprime(i)),i=4..60) ];
%t NextPrime[NextPrime[#,-1],-1]&/@Range[4,80] (* _Harvey P. Dale_, Oct 01 2012 *)
%Y a(n) = A007917(A007917(n-1)-1).
%K nonn
%O 4,1
%A _N. J. A. Sloane_.
%E More terms from _David Wasserman_, Aug 13 2002