id:A114064 - OEIS Search Results

Search: id:A114064

Displaying 1-1 of 1 results found.

page 1

Numbers n such that tau(n) does not divide sigma(n)*phi(n), where tau(n)=A000005(n).

+0
1

2, 4, 12, 16, 25, 36, 48, 64, 75, 80, 81, 100, 112, 121, 144, 162, 192, 208, 225, 240, 256, 272, 289, 300, 320, 324, 336, 363, 368, 400, 405, 448, 484, 512, 529, 560, 567, 576, 592, 624, 688, 700, 704, 720, 729, 752, 768, 784, 810, 816, 841, 848, 867, 900 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`tau[400]=15=35 does not divide phi(400)sigma(400)=153760=2^5531^2.`
	CROSSREFS	`Sequence in context: A039564 A067268 A082458 this_sequence A071118 A132314 A053636` `Adjacent sequences: A114061 A114062 A114063 this_sequence A114065 A114066 A114067`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

page 1

Search completed in 0.002 seconds

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

AT&T Labs Research