id:A070108 - OEIS Search Results

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Number of integer triangles with perimeter n and prime side lengths which are obtuse and isosceles.

+0
6

0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`R. Zumkeller, Integer-sided triangles`
	EXAMPLE	`a(k)<=1 until k = 140, for k = 141 there are A005044(141)=432 integer triangles, a(141)=2 as` `[37=37<67]: 37+37+67 = 141 and 2(37^2)<67^2 and 37, 67 are primes,` `[41=41<59]: 41+41+59 = 141 and 2(41^2)<59^2 and 41, 59 are primes.`
	CROSSREFS	`Cf. A070080, A070081, A070082, A070101, A059169, A070088, A070092, A070103, A070106, A070135.` `Sequence in context: A144600 A005088 A011686 this_sequence A011675 A096094 A011687` `Adjacent sequences: A070105 A070106 A070107 this_sequence A070109 A070110 A070111`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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