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Search: id:A070297
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| A070297 |
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Smallest number with n unrelated numbers (numbers which are neither coprime nor a divisor), or 0 if no such number exists. |
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+0
4
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| 3, 6, 0, 10, 15, 14, 21, 18, 35, 22, 33, 26, 39, 0, 65, 30, 36, 38, 57, 44, 95, 46, 63, 42, 115, 50, 64, 58, 87, 54, 75, 68, 155, 60, 99, 74, 111, 72, 185, 66, 117, 86, 129, 92, 215, 94, 141, 78, 235, 84, 105, 98, 100, 96, 265, 90, 135, 118, 147, 122, 183, 108
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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The 0's are only conjectures (search extended to 2000).
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EXAMPLE
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a(0) = 4, as 4 has no unrelated numbers less than it. a(5) = 14. The unrelated numbers pertaining to 14 are 4,6,8 10 and 12.
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PROGRAM
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(PARI) for(n=0, 100, s=-1:k=2:while(s!=n&&k<2000, k=k+1:s=0:for(l=2, k-1, if((k%l>0)&&gcd(k, l)>1, s=s+1))): if(k==2000, k=0):print1(k", "))
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CROSSREFS
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Cf. A070298.
Sequence in context: A153097 A077086 A010618 this_sequence A094674 A125287 A009014
Adjacent sequences: A070294 A070295 A070296 this_sequence A070298 A070299 A070300
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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 Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 22 2003
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