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A053673
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Least number coprime to n, n+1, n+2, n+3 and n+4.
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3
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7, 7, 11, 11, 11, 11, 13, 7, 7, 17, 17, 11, 11, 11, 7, 7, 11, 13, 13, 13, 13, 7, 7, 11, 11, 11, 11, 11, 7, 7, 13, 13, 13, 11, 11, 7, 7, 11, 11, 13, 13, 13, 7, 7, 11, 11, 11, 11, 11, 7, 7, 17, 13, 13, 13, 11, 7, 7, 11, 11, 11, 17, 17, 7, 7, 13, 11, 11, 11, 11, 7, 7, 13, 17, 17, 17, 17
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
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MATHEMATICA
| Table[k=2; While[First[Union[CoprimeQ[k, #]&/@(n+Range[0, 4])]]== False, k++]; k, {n, 80}] (* From Harvey P. Dale, Jul 07 2011 *)
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PROG
| (Haskell)
import Data.List (elemIndex)
import Data.Maybe (fromJust)
a053673 n = 2 + fromJust
(elemIndex 1 $ map (gcd $ foldl1 lcm $ take 5 [n..]) [2..])
-- Reinhard Zumkeller, Sep 25 2011
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CROSSREFS
| Cf. A053669-A053674.
Sequence in context: A064496 A084513 A084523 * A204910 A152672 A003883
Adjacent sequences: A053670 A053671 A053672 * A053674 A053675 A053676
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Feb 15 2000
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EXTENSIONS
| More terms from Andrew Gacek (andrew(AT)dgi.net), Feb 21 2000 and James A. Sellers (sellersj(AT)math.psu.edu), Feb 22 2000
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