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A066752
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a(n) = GCD(prime(n)+1, n+1).
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3
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1, 1, 2, 1, 6, 7, 2, 1, 2, 1, 4, 1, 14, 1, 16, 1, 6, 1, 4, 3, 2, 1, 12, 5, 2, 3, 4, 1, 10, 1, 32, 33, 2, 35, 6, 1, 2, 1, 8, 1, 6, 1, 4, 1, 2, 1, 4, 7, 2, 1, 26, 1, 2, 1, 2, 3, 2, 1, 2, 1, 2, 21, 4, 13, 2, 1, 4, 1, 2, 1, 6, 1, 2, 1, 76, 1, 78, 1, 2, 1, 2, 1, 12, 1, 2, 3, 2, 1, 6, 1, 4, 3, 2, 1, 4, 1, 2, 9, 4
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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a(23) = GCD(prime(23)+1,23+1) = GCD(83+1,24) = GCD(84,24) = 12*GCD(7,2) = 12.
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MATHEMATICA
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Table[GCD[Prime[w]+1, w+1], {w, 1, 128}]
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PROG
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(PARI) { for (n=1, 1000, write("b066752.txt", n, " ", gcd(prime(n) + 1, n + 1)) ) } [From Harry J. Smith, Mar 22 2010]
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CROSSREFS
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Cf. A000040.
Cf. A084309-A084316.
Sequence in context: A052636 A172430 A084312 * A192329 A059364 A217922
Adjacent sequences: A066749 A066750 A066751 * A066753 A066754 A066755
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller, Jan 16, 2002
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EXTENSIONS
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More terms from Labos E. (labos(AT)ana.sote.hu), Jun 13 2003
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STATUS
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approved
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