login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A118643 Lucky numbers n whose prime factors are also lucky numbers. 2
1, 3, 7, 9, 13, 21, 31, 37, 43, 49, 63, 67, 73, 79, 93, 111, 127, 129, 151, 163, 169, 189, 193, 201, 211, 219, 223, 237, 241, 259, 273, 283, 307, 331, 349, 367, 409, 421, 433, 463, 487, 489, 511, 541, 553, 559, 577, 579, 601, 613, 619, 631, 643, 651, 673, 723 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
189 is included since 189 is lucky and 189 = 3*3*3*7 has prime factors that are all lucky.
CROSSREFS
Cf. A000959.
Cf. A043772 (superset).
Sequence in context: A291344 A297002 A111250 * A043772 A176553 A109370
KEYWORD
easy,nonn
AUTHOR
Adam Panagos (adam.panagos(AT)gmail.com), May 10 2006
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 25 00:10 EDT 2024. Contains 374585 sequences. (Running on oeis4.)