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A093354
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Number of prime triples (p,q,r) with p<q<r<=n and q-p=r-q.
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1
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0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 9, 9, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 13, 13, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 20, 20, 20, 20, 20, 20, 23, 23, 24, 24, 24, 24, 24, 24, 26, 26, 26, 26, 30, 30, 32, 32, 32, 32, 32, 32, 36
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| a(20)=5: (3,5,7)_5-3=7-5, (3,7,11)_7-3=11-7,
(5,11,17)_11-5=17-11, (3,11,19)_11-3=19-11 and (7,13,19)_13-7=19-13.
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CROSSREFS
| Sequence in context: A122521 A086394 A029226 * A109701 A124751 A103374
Adjacent sequences: A093351 A093352 A093353 * A093355 A093356 A093357
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 27 2004
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