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A214422
Least number k > 9 that is palindromic in exactly n bases b, with 2 <= b <= 10.
0
19, 11, 15, 10, 121
OFFSET
0,1
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.
EXAMPLE
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).
Sequence in context: A269260 A050276 A107808 * A141045 A157411 A166525
KEYWORD
nonn,base,hard,fini
AUTHOR
T. D. Noe, Jul 18 2012
STATUS
approved