|
Search: id:A065531
|
|
|
| A065531 |
|
Number of palindromes in all base b representations for n, for 2<=b<=n. |
|
+0
7
|
|
| 1, 0, 1, 1, 2, 1, 2, 2, 2, 3, 1, 2, 2, 2, 3, 3, 3, 3, 1, 3, 4, 2, 2, 4, 2, 4, 3, 4, 2, 3, 3, 3, 3, 3, 2, 5, 2, 3, 2, 5, 2, 4, 2, 3, 4, 4, 1, 5, 2, 4, 4, 5, 1, 4, 4, 4, 4, 2, 2, 6, 2, 3, 5, 4, 5, 4, 3, 4, 2, 4, 2, 6, 3, 3, 3, 3, 2, 6, 1, 7, 3, 4, 2, 6, 5, 3, 2, 5, 2, 5, 4, 5, 4, 2, 2, 6, 2, 5, 4, 7, 2, 4, 1, 6, 6
(list; graph; listen)
|
|
|
OFFSET
|
1,5
|
|
|
COMMENT
|
a(1) = 1 by convention.
|
|
MATHEMATICA
|
palindromicBases[n_] := Module[{p}, Table[p = IntegerDigits[n, b]; If[ p == Reverse[p], {b, p}, Sequence @@ {}], {b, 2, n - 1}]]; Table[ Length[ palindromicBases[n]], {n, 105}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), May 12 2005)
|
|
CROSSREFS
|
Cf. A033868, A016038, A047811, A037183, A107129.
Sequence in context: A085693 A067995 A135551 this_sequence A131840 A057368 A085033
Adjacent sequences: A065528 A065529 A065530 this_sequence A065532 A065533 A065534
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Naohiro Nomoto (n_nomoto(AT)yabumi.com), Dec 02 2001
|
|
|
Search completed in 0.002 seconds
|
