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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, 23, 23, 26, 29, 29, 31, 31, 31, 31, 31, 34, 37, 37, 37, 38, 41, 41, 43, 43, 43, 43, 47, 47, 47, 47, 47, 47, 53, 53, 53, 53, 53
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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REFERENCES
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S. K. Stein and S. Szabo, Algebra and Tiling, MAA Carus Monograph 25, 1994, page 104.
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LINKS
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MAPLE
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f:= proc(n) max(prevprime(n), 2*prevprime(floor((n-1)/2))) end proc:
for i from 1 to 6 do f(i):= [1, 2, 2, 3, 3, 5, 5][i] od:
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MATHEMATICA
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Join[{1, 2}, Table[Max[NextPrime[n, -1], 2NextPrime[Floor[(n-1)/2], -1]], {n, 3, 70}]] (* Harvey P. Dale, Mar 12 2022 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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