A119757 a(n) = n-th composite positive integer from among those composites which are coprime to the n-th composite.

9, 35, 21, 14, 39, 77, 45, 32, 45, 115, 77, 40, 65, 133, 32, 77, 46, 95, 289, 85, 62, 95, 54, 205, 111, 74, 153, 319, 129, 104, 125, 253, 57, 187, 92, 153, 289, 81, 185, 104, 159, 511, 165, 128, 165, 93, 413, 189, 122, 333, 365, 195, 169, 207, 102, 469, 291, 134, 215

Offset

1,1

Links

Table of n, a(n) for n=1..59.

Example

8 is the 3rd composite. 9,15,21,25,... is the sequence of composites which are coprime to 8. 21 is the 3rd term of these composites, so a(3) = 21.

Prog

(PARI) {m=59; c=1; for(n=1, m, c++; while(isprime(c), c++); e=4; k=n; while(k>0, d=e; if(gcd(d, c)==1, k--); e=d+1; while(isprime(e), e++)); print1(d, ", "))} - (Klaus Brockhaus, Aug 15 2006)

Crossrefs

Sequence in context: A119389 A197273 A067960 * A003865 A265377 A187554

Adjacent sequences: A119754 A119755 A119756 * A119758 A119759 A119760

Keyword

nonn

Author

Leroy Quet, Aug 04 2006

Extensions

More terms from Klaus Brockhaus, Aug 15 2006

Status

approved