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Search: id:A132995
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| A132995 |
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a(n) = GCD(sum{k=1 to n} p(k), product{j=1 to n} p(j)), where p(k) is the kth prime. |
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+0
1
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| 2, 1, 10, 1, 14, 1, 2, 77, 10, 3, 10, 1, 238, 1, 82, 3, 110, 3, 2, 213, 2, 7, 874, 3, 530, 129, 158, 3, 370, 177, 430, 3, 994, 3, 2, 3, 646, 2747, 2914, 21, 3266, 3, 3638, 3, 2014, 3, 14, 4661, 1222, 5117
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OFFSET
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1,1
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EXAMPLE
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The first 7 primes are 2,3,5,7,11,13,17. 2+3+5+7+11+13+17 = 58 = 2*29. So a(7) = GCD(58, 2*3*5*7*11*13*17) = 2.
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MAPLE
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seq(gcd(add(ithprime(i), i=1..n), mul(ithprime(j), j=1..n)), n=1..50); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 24 2007
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CROSSREFS
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Cf. A007504, A002110.
Sequence in context: A074951 A055633 A105606 this_sequence A114692 A112691 A110169
Adjacent sequences: A132992 A132993 A132994 this_sequence A132996 A132997 A132998
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Nov 22 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 24 2007
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