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Search: id:A070088
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| A070088 |
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Number of prime integer triangles with perimeter n. |
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+0
12
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| 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 2, 1, 2, 0, 1, 0, 1, 0, 1, 1, 2, 0, 3, 1, 3, 0, 2, 0, 2, 0, 3, 1, 3, 0, 5, 1, 5, 0, 4, 0, 3, 0, 5, 1, 5, 0, 4, 0, 4, 0, 2, 0, 3, 0, 5, 1, 3, 0, 6, 1, 8, 0, 5, 0, 5, 0, 4, 0, 3, 0, 5, 1, 6, 0, 6, 0, 4, 0, 7, 1, 7, 0, 9, 1, 10, 0
(list; graph; listen)
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OFFSET
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1,15
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COMMENT
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a(n) = A070090(n) + A070092(n) = A070095(n) + A070103(n).
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LINKS
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R. Zumkeller, Integer-sided triangles
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EXAMPLE
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For n=15 there are A005044(15)=7 integer triangles: [1,7,7], [2,6,7], [3,5,7], [3,6,6], [4,4,7], [4,5,6] and [5,5,5]: two of them consist of primes, therefore a(15)=2.
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CROSSREFS
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Cf. A070080, A070081, A070082, A070097, A070100, A070105, A070108, A070111.
Sequence in context: A098356 A082995 A079549 this_sequence A131851 A104886 A139351
Adjacent sequences: A070085 A070086 A070087 this_sequence A070089 A070090 A070091
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002
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