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A060265 Largest prime less than 2n.

%I A060265 #23 Dec 11 2024 23:41:12
%S A060265 3,5,7,7,11,13,13,17,19,19,23,23,23,29,31,31,31,37,37,41,43,43,47,47,
%T A060265 47,53,53,53,59,61,61,61,67,67,71,73,73,73,79,79,83,83,83,89,89,89,89,
%U A060265 97,97,101,103,103,107,109,109,113,113,113,113,113,113,113,127,127,131
%N A060265 Largest prime less than 2n.
%C A060265 a(n) = A007917(2*n) = A255313(n-1,1) = A255316(n-1,1) = A006530(A255427(n)). - _Reinhard Zumkeller_, Feb 22 2015
%H A060265 Harry J. Smith, <a href="/A060265/b060265.txt">Table of n, a(n) for n = 2..1000</a>
%p A060265 seq (prevprime(2*i+1), i=2..256);
%t A060265 Table[NextPrime[2 n, -1], {n, 2, 66}] (* _Michael De Vlieger_, Jul 04 2016 *)
%o A060265 (PARI) a(n) = precprime(2*n-1) \\ _Harry J. Smith_, Jul 03 2009
%o A060265 (Haskell)
%o A060265 a060265 = a007917 . (* 2)  -- _Reinhard Zumkeller_, Feb 22 2015
%Y A060265 Apart from initial term, same as A060308.
%Y A060265 Cf. A020482, A049653, A088631, A007917, A005843, A255313.
%K A060265 nonn,easy
%O A060265 2,1
%A A060265 _Labos Elemer_, Mar 23 2001