login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117289 Numbers n for which the cototient n-phi(n) is a enneagonal number. 1
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; refs; listen; history; internal format)
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: A171057 A074721 A152073 * A106317 A152242 A166504

Adjacent sequences:  A117286 A117287 A117288 * A117290 A117291 A117292

KEYWORD

nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 11:46 EST 2012. Contains 206011 sequences.