|
| |
|
|
A081391
|
|
n is such that C[2n,n] central binomial coefficient has only one prime divisor of which exponent equals one, i.e. A081387[n]=1; C[2n,n] with one non-unitary prime divisor.
|
|
2
|
|
|
|
3, 6, 7, 8, 9, 10, 11, 12, 16, 21, 22, 28, 29, 30, 31, 36, 37, 54, 55, 57, 58, 110, 171, 784, 786
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..25.
|
|
|
EXAMPLE
|
n=786: C[1572,786]=2.2.2.2.K, where K is a squarefree product of 169 primes.
|
|
|
CROSSREFS
|
Cf. A000984, A001405, A000108, A081386-A081390, A046098, A080664.
Sequence in context: A133339 A112267 A068985 * A073850 A048748 A030781
Adjacent sequences: A081388 A081389 A081390 * A081392 A081393 A081394
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Mar 27 2003
|
|
|
STATUS
|
approved
|
| |
|
|
