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Search: id:A070295
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| A070295 |
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Smallest composite number such that there are exactly n primes less than it (and coprime to it) which do not divide it, or 0 if no such number exists. |
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+0
1
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| 4, 10, 8, 14, 16, 20, 24, 25, 33, 32, 0, 44, 48, 49, 66, 62, 64, 72, 74, 80, 81, 91, 98, 105, 104, 108, 111, 115, 121, 128, 140, 141, 154, 152, 158, 164, 171, 169, 182, 183, 192, 194, 204, 200, 212, 224, 230, 232, 235, 246, 242, 243, 256, 265, 273, 272, 278, 285
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Are there any zero values other than a(11) = 0?
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EXAMPLE
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a(4) = 14: primes up to 14 are 2, 3, 5, 7, 11, 13 out of which four primes 3, 5, 11 and 13 are coprime to 14.
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CROSSREFS
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Sequence in context: A129531 A014476 A080362 this_sequence A123483 A073722 A053248
Adjacent sequences: A070292 A070293 A070294 this_sequence A070296 A070297 A070298
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 10 2002
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EXTENSIONS
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Corrected and extended by Larry Reeves (larryr(AT)acm.org), Oct 01 2002
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