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Search: id:A140115
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| A140115 |
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a(n)=number of "pseutriprimes (product of 3 distinct primes) >(n-1)^3 and < n^3. |
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+0
1
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| 0, 0, 0, 2, 6, 8, 12, 18, 20, 27, 30, 43, 44, 60, 58, 76, 75, 88, 112, 106, 124, 160
(list; graph; listen)
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OFFSET
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0,4
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EXAMPLE
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The first pseutriprimes are 30,42,66,70,78,102,110,114,130
None is <27, hence a(1)=a(2)=a(3)=0
30 and 42 are < 64, hence a(4)=2
6 more are <125, hence a(5)=6
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CROSSREFS
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Cf. A140114.
Adjacent sequences: A140112 A140113 A140114 this_sequence A140116 A140117 A140118
Sequence in context: A111224 A139718 A135311 this_sequence A093006 A138639 A082473
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KEYWORD
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easy,nonn
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AUTHOR
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Philippe Lallouet (philip.lallouet(AT)orange.fr), May 08 2008
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