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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 (list; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=0..4.

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

Adjacent sequences:  A214419 A214420 A214421 * A214423 A214424 A214425

KEYWORD

nonn,base,hard,fini

AUTHOR

T. D. Noe, Jul 18 2012

STATUS

approved

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Last modified January 29 01:54 EST 2020. Contains 331328 sequences. (Running on oeis4.)