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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
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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 August 30 00:57 EDT 2024. Contains 375520 sequences. (Running on oeis4.)