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A035032
For n >= 6, max( prevprime(n), 2*prevprime(floor(n/2))).
1
1, 2, 2, 3, 3, 5, 5, 7, 7, 7, 7, 11, 11, 13, 13, 14, 14, 17, 17, 19, 19, 19, 19, 23, 23, 23, 23, 26, 26, 29, 29, 31, 31, 31, 31, 34, 34, 37, 37, 38, 38, 41, 41, 43, 43, 43, 43, 47, 47, 47, 47, 47, 47, 53, 53, 53, 53, 53
OFFSET
1,2
REFERENCES
S. K. Stein and S. Szabo, Algebra and Tiling, MAA Carus Monograph 25, 1994, page 104.
CROSSREFS
Cf. A035031.
Sequence in context: A340285 A341462 A035031 * A121260 A121261 A085885
KEYWORD
nonn
AUTHOR
STATUS
approved