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Search: id:A100755
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| A100755 |
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Smallest prime factor of the concatenation of terms in the n-th row of Pascal's Triangle. |
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+0
4
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| 11, 11, 11, 11, 7, 43, 29, 18285670562881, 5647, 13, 11, 523, 180642383, 41, 17, 7, 71, 31, 4506133, 13, 170777, 29, 1921778735419, 11, 31, 197, 13, 524243, 12940636542375111875547502015607804292145100150052003001034597290518959356786391\ 57755876077558760678639155189593534597290200300101001500542921451560780475020118\ 755237513654406291
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(4) = 11 is the least prime factor of 14641 = 11^4.
a(5) = 7 as 15101051 = 7* 2157293.
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MATHEMATICA
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f[n_] := (Table[ #[[1]], {1}] & /@ FactorInteger[ FromDigits[ Flatten[ Table[ IntegerDigits[ Binomial[n, k]], {k, 0, n}]]], FactorComplete -> False])[[1, 1]]; Table[ f[n], {n, 29}] (from Robert G. Wilson v Dec 02 2004)
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CROSSREFS
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Cf. A100756.
Sequence in context: A087380 A152986 A087994 this_sequence A045538 A084066 A112122
Adjacent sequences: A100752 A100753 A100754 this_sequence A100756 A100757 A100758
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 23 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 02 2004
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