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A053671
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Least number coprime to n, n+1 and n+2.
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2
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5, 5, 7, 7, 11, 5, 5, 7, 7, 7, 5, 5, 11, 11, 7, 5, 5, 7, 11, 13, 5, 5, 7, 7, 7, 5, 5, 11, 7, 7, 5, 5, 13, 11, 11, 5, 5, 7, 7, 11, 5, 5, 7, 7, 7, 5, 5, 11, 11, 7, 5, 5, 7, 13, 13, 5, 5, 7, 7, 7, 5, 5, 11, 7, 7, 5, 5, 11, 11, 11, 5, 5, 7, 7, 13, 5, 5, 7, 7, 7, 5, 5, 11, 11, 7, 5, 5, 7, 11, 11, 5, 5
(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 = 5; While[! (CoprimeQ[k, n] && CoprimeQ[k, n+1] && CoprimeQ[k, n+2]), k++]; k); Table[a[n], {n, 1, 92}] (* From Jean-François Alcover, Nov 30 2011 *)
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PROG
| (Haskell)
a053671 n = f $ drop 2 a000040_list where
f (p:ps) | (n `mod` p) * ((n+1) `mod` p) * ((n+2) `mod` p) > 0 = p
| otherwise = f ps
-- Reinhard Zumkeller, Mar 19 2011
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CROSSREFS
| Cf. A053669-A053674.
Sequence in context: A133888 A111186 A127798 * A028278 A095943 A120220
Adjacent sequences: A053668 A053669 A053670 * A053672 A053673 A053674
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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 James A. Sellers (sellersj(AT)math.psu.edu), Feb 22 2000
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