A214422 Least number k > 9 that is palindromic in exactly n bases b, with 2 <= b <= 10.

19, 11, 15, 10, 121

Offset: 0

Author

T. D. Noe, Jul 18 2012

Keywords

• nonn
• base
• hard
• fini

Comments

There are no other terms < 10^12. The ultimate goal is to find (probably a very large) k that is palindromic in all 9 bases 2 to 10.

Examples

			19 is not palindromic in bases 2 to 10.
11 is palindromic in base 10.
15 is palindromic in bases 2 and 4.
10 is palindromic in bases 3, 4, and 9.
121 is palindromic in bases 3, 7, 8, and 10.
		

Crossrefs

Cf. A050813, A214423, A214424, A214425, A214426 (palindromic in 0-4 bases).