A083457 Smallest nontrivial k such that k^n - 1 is a palindrome (k >1 for n>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

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: A308693 A339481 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