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A083457 Smallest nontrivial k such that k^n - 1 is a palindrome (k >1 for n>1). 1
1, 2, 2, 10, 3, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The sequence is infinite as 10 always qualifies: 10^k - 1 is always a palindrome, hence a(n) <=10. Is there any n > 5 for which a(n) is not equal to 10?

LINKS

Table of n, a(n) for n=1..71.

EXAMPLE

a(5) = 3 as 3^5 -1 = 242 is a palindrome.

CROSSREFS

Cf. A083456.

Sequence in context: A319692 A308693 A163937 * A163808 A223126 A127058

Adjacent sequences:  A083454 A083455 A083456 * A083458 A083459 A083460

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 01 2003

EXTENSIONS

More terms from David Wasserman, Nov 11 2004

STATUS

approved

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Last modified April 14 05:22 EDT 2021. Contains 342943 sequences. (Running on oeis4.)