The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A121683 Untouchable cubes. 1
216, 1728, 5832, 8000, 13824, 21952, 27000, 74088, 110592, 157464, 175616, 195112, 216000, 238328, 287496, 314432, 343000, 373248, 729000, 884736, 941192, 1061208, 1124864, 1259712, 1481544, 1728000, 2000376, 2097152, 2628072, 2744000, 2985984, 3241792, 3511808 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Untouchable numbers (cf. A005114) that are third powers (cf. A000578); a(1) to a(7) are the third powers of 6, 12, 18, 20, 24, 28, 30.
LINKS
EXAMPLE
216 = 6^3 = A000578(6) = A005114(13).
CROSSREFS
Intersection of A000578 and A005114.
Cf. A111278 (untouchable squares).
Sequence in context: A233974 A016863 A033698 * A016911 A370693 A323801
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Aug 15 2006
EXTENSIONS
a(8)-a(30) from Donovan Johnson, Jul 19 2008
Terms a(26)-a(30) corrected and a(31)-a(33) added by Amiram Eldar, Sep 23 2022
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 May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)