id:A062828 - OEIS Search Results

Search: id:A062828

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GCD of 2n and n(n+1)/2.

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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; listen)

	OFFSET	`1,3`
	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`
	PROGRAM	`(PARI) j=[]; for(n=1, 150, j=concat(j, gcd(2n, n(n+1)/2))); j`
	CROSSREFS	`Sequence in context: A021020 A007320 A007321 this_sequence A124457 A063720 A006942` `Adjacent sequences: A062825 A062826 A062827 this_sequence A062829 A062830 A062831`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 20 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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