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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A046231 Numbers n such that n^3 is palindromic in base 4. 2
0, 1, 5, 17, 65, 257, 1025, 4097, 16385, 65537, 262145, 1048577, 4194305, 16777217, 67108865, 268435457, 1073741825, 4294967297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Base-2 and base 3 do not yield results below 10^8.

Next term is >10000000000 - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 09 2006

LINKS

Table of n, a(n) for n=1..18.

P. De Geest, World!Of Numbers

FORMULA

It seems that for n>=2, a(n)=4^(n-1)+1. - Benoit Cloitre, Dec 07 2003

MATHEMATICA

For[i = 1, i < 1000000, i++, tmp = IntegerDigits[i^3, 4]; If[tmp == Reverse[tmp], Print[i]] ]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 09 2006

CROSSREFS

Cf. A046232.

Cf. A052539. [From R. J. Mathar, Oct 13 2008]

Sequence in context: A273535 A149672 A149673 * A092896 A149674 A149675

Adjacent sequences:  A046228 A046229 A046230 * A046232 A046233 A046234

KEYWORD

nonn,more,base

AUTHOR

Patrick De Geest, May 15 1998

EXTENSIONS

More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 09 2006, corrected Nov 01 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 23 02:46 EDT 2017. Contains 286909 sequences.