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A062828
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GCD of 2n and n(n+1)/2.
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0
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1, 1, 6, 2, 5, 3, 14, 4, 9, 5, 22, 6, 13, 7, 30, 8, 17, 9, 38, 10, 21, 11, 46, 12, 25, 13, 54, 14, 29, 15, 62, 16, 33, 17, 70, 18, 37, 19, 78, 20, 41, 21, 86, 22, 45, 23, 94, 24, 49, 25, 102, 26, 53, 27, 110, 28, 57, 29, 118, 30, 61, 31, 126, 32, 65, 33, 134, 34, 69, 35, 142
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(4n+1) = 4n+1, a(4n+2) = 2n+1, a(4n+3) = 8n+6, a(4n+4) = 2n+2. - Ralf Stephan, Jun 10 2005
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PROG
| (PARI) j=[]; for(n=1, 150, j=concat(j, gcd(2*n, n*(n+1)/2))); j
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CROSSREFS
| Sequence in context: A007320 A199734 A007321 * A124457 A063720 A006942
Adjacent sequences: A062825 A062826 A062827 * A062829 A062830 A062831
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KEYWORD
| easy,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jul 20 2001
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