id:A070084 - OEIS Search Results

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Greatest common divisor of sides of integer triangles [A070080(n), A070081(n), A070082(n)], sorted by perimeter, sides lexicographically ordered.

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1, 1, 2, 1, 1, 1, 1, 1, 3, 2, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 3, 1, 1, 5, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 7, 2, 1, 2, 1, 1, 1 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n)>1 iff there exists a smaller similar triangle [A070080(k), A070081(k), A070082(k)] with k<n and A070080(n)=A070080(k)a(n), A070081(n)=A070081(k)a(n) and A070082(n)=A070082(k)*a(n).`
	LINKS	`R. Zumkeller, Integer-sided triangles`
	FORMULA	`a(n) = GCD(A070080(n), A070081(n), A070082(n)).`
	CROSSREFS	`Cf. A051493, A005044, A070091, A070094, A070102, A070109, A070110, A070113, A070116, A070119, A070128, A070137.` `Sequence in context: A101446 A062760 A014649 this_sequence A060176 A010248 A132068` `Adjacent sequences: A070081 A070082 A070083 this_sequence A070085 A070086 A070087`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002`

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.

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