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A053674
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Least number coprime to n, n+1, n+2, n+3, n+4 and n+5.
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13
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7, 11, 11, 11, 11, 13, 13, 7, 17, 17, 17, 11, 11, 11, 7, 11, 13, 13, 13, 13, 17, 7, 11, 11, 11, 11, 11, 13, 7, 13, 13, 13, 13, 11, 11, 7, 11, 11, 17, 13, 13, 13, 7, 13, 11, 11, 11, 11, 11, 7, 19, 17, 13, 13, 13, 11, 7, 11, 11, 11, 17, 17, 19, 7, 19, 13, 11, 11, 11, 11, 7, 13
(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
| a[n_] := (k = 7; While[ ! And @@ (CoprimeQ[k, #] & ) /@ Range[n, n+5], k++]; k); Table[a[n], {n, 1, 72}] (* From Jean-François Alcover, Nov 30 2011 *)
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PROG
| (Haskell)
import Data.List (elemIndex)
import Data.Maybe (fromJust)
a053674 n = 2 + fromJust
(elemIndex 1 $ map (gcd $ foldl1 lcm $ take 6 [n..]) [2..])
-- Reinhard Zumkeller, Sep 25 2011
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CROSSREFS
| Cf. A053669-A053673.
Sequence in context: A071631 A054510 A134702 * A205679 A166980 A184071
Adjacent sequences: A053671 A053672 A053673 * A053675 A053676 A053677
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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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