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A186711
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Greatest common divisor of the n-th and (n+1)st 3-smooth numbers.
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6
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1, 1, 1, 2, 2, 1, 3, 4, 2, 6, 3, 1, 4, 12, 6, 2, 8, 9, 3, 12, 4, 16, 18, 6, 24, 27, 1, 32, 36, 12, 48, 54, 2, 64, 72, 81, 3, 96, 108, 4, 128, 144, 162, 6, 192, 216, 8, 1, 9, 288, 324, 12, 384, 432, 16, 2, 18, 576, 648, 24, 3, 27, 864, 32, 4, 36, 1152, 1296, 48, 6, 54, 1728, 64, 8, 72, 9, 81, 2592, 96, 12
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OFFSET
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1,4
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COMMENTS
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LINKS
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FORMULA
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MAPLE
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MATHEMATICA
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S3 = Select[Range[3*10^4], FactorInteger[#][[-1, 1]] <= 3&]; Table[GCD[ S3[[n]], S3[[n+1]] ], {n, 1, Length[S3]-1}] (* Jean-François Alcover, Feb 02 2018 *)
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PROG
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(Haskell)
a186711 n = a186711_list !! (n-1)
a186711_list = zipWith gcd a003586_list $ tail a003586_list
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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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