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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
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?
EXAMPLE
a(5) = 3 as 3^5 -1 = 242 is a palindrome.
CROSSREFS
Cf. A083456.
Sequence in context: A308693 A339481 A163937 * A163808 A223126 A127058
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