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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. +0
3
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; listen)
OFFSET

1,1

EXAMPLE

n=786: C[1572,786]=2.2.2.2.K, where K is a square-free product of 169 primes.

CROSSREFS

Cf. A000984, A001405, A000108, A081386-A081390, A046098, A080664.

Adjacent sequences: A081388 A081389 A081390 this_sequence A081392 A081393 A081394

Sequence in context: A133339 A112267 A068985 this_sequence A073850 A048748 A030781

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Mar 27 2003

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.


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