id:A039593 - OEIS Search Results

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Number of unitary divisors of central binomial coefficients.

+0
3

1, 2, 2, 4, 4, 4, 4, 8, 8, 8, 16, 16, 16, 16, 16, 32, 32, 32, 32, 32, 64, 64, 64, 64, 64, 64, 64, 64, 128, 128, 128, 256, 256, 256, 512, 512, 512, 512, 1024, 1024, 1024, 1024, 1024, 1024, 512, 512, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 4096, 4096 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`By definitions (A034444)the present terms are powers of two.`
	EXAMPLE	`At n=5 the central binomial coeff. is 10, having 4 divisors, all of them are unitary, so so a[ 5 ]=4.`
	CROSSREFS	`A034444 [ A001405 [ n ] ] = 2^(A034973[ A001405[ n ] ]).` `Sequence in context: A105678 A028397 A053644 this_sequence A101656 A090557 A035660` `Adjacent sequences: A039590 A039591 A039592 this_sequence A039594 A039595 A039596`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research