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A035031 For n >= 6, max( prevprime(n), 2*prevprime(floor((n-1)/2))). 1

%I

%S 1,2,2,3,3,5,5,7,7,7,7,11,11,13,13,13,14,17,17,19,19,19,19,23,23,23,

%T 23,23,26,29,29,31,31,31,31,31,34,37,37,37,38,41,41,43,43,43,43,47,47,

%U 47,47,47,47,53,53,53,53,53

%N For n >= 6, max( prevprime(n), 2*prevprime(floor((n-1)/2))).

%D S. K. Stein and S. Szabo, Algebra and Tiling, MAA Carus Monograph 25, 1994, page 104.

%Y Cf. A035032.

%K nonn

%O 1,2

%A _N. J. A. Sloane_.

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Last modified November 29 11:46 EST 2021. Contains 349416 sequences. (Running on oeis4.)