id:A117289 - OEIS Search Results

Search: id:A117289

Displaying 1-1 of 1 results found.

page 1

Numbers n for which the cototient n-phi(n) is a enneagonal number.

+0
2

1, 2, 3, 5, 7, 11, 13, 17, 19, 21, 23, 27, 29, 31, 36, 37, 40, 41, 43, 44, 46, 47, 53, 59, 61, 66, 67, 70, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 207, 211, 219, 223, 227, 229, 231 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`44 is in the sequence because 44-phi(44)=24, which is a enneagonal number.`
	CROSSREFS	`Cf. A001106.` `Sequence in context: A117094 A074721 A152073 this_sequence A106317 A152242 A166504` `Adjacent sequences: A117286 A117287 A117288 this_sequence A117290 A117291 A117292`
	KEYWORD	`nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006`

page 1

Search completed in 0.002 seconds

Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

AT&T Labs Research