A070297 Smallest number with n unrelated numbers (numbers which are neither coprime nor a divisor), or 0 if no such number exists.

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

Offset

0,1

Comments

The 0's are only conjectures (search extended to 2000).

Links

Table of n, a(n) for n=0..61.

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

Adjacent sequences: A070294 A070295 A070296 * A070298 A070299 A070300

Keyword

nonn

Author

Amarnath Murthy, May 10 2002

Extensions

Corrected and extended by Ralf Stephan, Mar 22 2003

Status

approved