|
Search: id:A050684
|
|
|
| A050684 |
|
Number of nonzero palindromes < 10^n and containing at least one digit '1'. |
|
+0
2
|
|
| 1, 2, 20, 38, 290, 542, 3710, 6878, 44390, 81902, 509510, 937118, 5685590, 10434062, 62170310, 113906558, 669532790, 1225159022, 7125795110, 13026431198, 75132155990, 137237880782, 786189403910, 1435140927038
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
FORMULA
|
a(2n) = 2*(10^n - 9^n); a(2n + 1) = 2*(10^n - 9^n) + 9*10^n - 8*9^n. - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 14 2002
|
|
EXAMPLE
|
Up to 10^2 we find two numbers 1 and 11.
|
|
CROSSREFS
|
Cf. A050250, A050685.
Sequence in context: A112271 A103076 A062133 this_sequence A073214 A097652 A059211
Adjacent sequences: A050681 A050682 A050683 this_sequence A050685 A050686 A050687
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
|
|
EXTENSIONS
|
More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 14 2002
|
|
|
Search completed in 0.002 seconds
|
