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A013638
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a(n) = prevprime(n)*nextprime(n).
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5
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10, 15, 21, 35, 55, 77, 77, 77, 91, 143, 187, 221, 221, 221, 247, 323, 391, 437, 437, 437, 551, 667, 667, 667, 667, 667, 713, 899, 1073, 1147, 1147, 1147, 1147, 1147, 1271, 1517, 1517, 1517, 1591, 1763, 1927
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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3,1
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LINKS
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FORMULA
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MAPLE
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[ seq(prevprime(i)*nextprime(i), i=3..70) ];
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MATHEMATICA
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a[n_] := NextPrime[n, -1] NextPrime[n];
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PROG
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(Haskell)
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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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