login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A052063 Numbers k such that the decimal expansion of k^3 contains no palindromic substring except single digits. 5
0, 1, 2, 3, 4, 5, 6, 8, 9, 12, 13, 16, 17, 18, 19, 21, 22, 24, 25, 27, 28, 29, 32, 33, 35, 37, 38, 39, 41, 43, 44, 47, 51, 57, 59, 65, 66, 69, 73, 75, 76, 84, 88, 93, 94, 97, 102, 108, 109, 115, 116, 123, 125, 128, 133, 134, 135, 139, 144, 145, 147, 148, 155, 156, 159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Leading zeros in substring are allowed so 52^2 = 140608 is rejected because 14{060}8 contains a palindromic substring.

Probabilistic analysis strongly suggests that this sequence is not finite. - Franklin T. Adams-Watters, Nov 15 2006

LINKS

Table of n, a(n) for n=1..65.

EXAMPLE

19^3 = 6859 -> substrings 68, 85, 59, 685, 859 and 6859 are all non-palindromic.

CROSSREFS

Cf. A052064, A052061, A052062, A050742.

Sequence in context: A101271 A093110 A165707 * A129525 A295165 A258023

Adjacent sequences:  A052060 A052061 A052062 * A052064 A052065 A052066

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jan 15 2000

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)