A033302 Largest prime < largest prime < n.

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, 23, 23, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 37, 37, 41, 41, 41, 41, 43, 43, 43, 43, 43, 43, 47, 47, 47, 47, 47, 47, 53, 53, 59, 59, 59, 59, 59, 59, 61, 61, 61, 61, 67, 67, 71, 71

Offset

4,1

Links

Table of n, a(n) for n=4..75.

Maple

[ seq(prevprime(prevprime(i)), i=4..60) ];

Mathematica

NextPrime[NextPrime[#, -1], -1]&/@Range[4, 80] (* Harvey P. Dale, Oct 01 2012 *)

Crossrefs

a(n) = A007917(A007917(n-1)-1).

Sequence in context: A276119 A167755 A259788 * A072729 A057872 A059974

Adjacent sequences: A033299 A033300 A033301 * A033303 A033304 A033305

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

More terms from David Wasserman, Aug 13 2002

Status

approved