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A070297 Smallest number with n unrelated numbers (numbers which are neither coprime nor a divisor), or 0 if no such number exists. 3
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; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
The 0's are only conjectures (search extended to 2000).
LINKS
EXAMPLE
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.
PROG
(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", "))
CROSSREFS
Cf. A070298.
Sequence in context: A077086 A010618 A287845 * A284896 A299032 A094674
KEYWORD
nonn
AUTHOR
Amarnath Murthy, May 10 2002
EXTENSIONS
Corrected and extended by Ralf Stephan, Mar 22 2003
STATUS
approved

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Last modified May 20 19:00 EDT 2024. Contains 372720 sequences. (Running on oeis4.)