|
Search: id:A111936
|
|
|
| A111936 |
|
Denominator of n-th term of the harmonic series after having removed all terms containing in decimal representation a 9. |
|
+0
2
|
|
| 1, 2, 6, 12, 60, 20, 140, 280, 280, 3080, 9240, 120120, 120120, 40040, 80080, 1361360, 12252240, 2450448, 2450448, 2450448, 56360304, 56360304, 1409007600, 1409007600, 4227022800, 4227022800, 4227022800, 131037706800, 262075413600
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Numerator = A111935;
A111935(n)/a(n) ---> C with C<80.
|
|
REFERENCES
|
G. Polya and G. Szego, Problems and Theorems in Analysis I (Springer 1924, reprinted 1972), Part One, Chap. 3, sect. 4, Problem 124.
|
|
EXAMPLE
|
n=9: 1/1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/10 = 789/280, therefore a(9) = 280.
|
|
CROSSREFS
|
Cf. A002805, A007095.
Sequence in context: A152873 A083001 A119862 this_sequence A002805 A117481 A083268
Adjacent sequences: A111933 A111934 A111935 this_sequence A111937 A111938 A111939
|
|
KEYWORD
|
nonn,base,frac
|
|
AUTHOR
|
Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 22 2005
|
|
|
Search completed in 0.002 seconds
|
