|
Search: id:A128192
|
|
|
| A128192 |
|
a(n) = denominator of b(n), where b(1)=1, b(n+1) = sum{k=1 to n} {b(n+1-k)/k} ({x} is the fractional part of x). |
|
+0
2
|
|
| 1, 1, 2, 6, 3, 60, 360, 2520, 1680, 15120, 2800, 831600, 9979200, 9266400, 165110400, 27243216000, 27243216000, 102918816000, 793945152000, 355537728000, 150849578880000, 22174888095360000, 3049047113112000, 43155743754816000
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
MATHEMATICA
|
f[l_List] := Block[{n = Length[l]}, Append[l, Sum[ FractionalPart[l[[n + 1 - k]]/k], {k, n}]]]; Denominator[Nest[f, {1}, 23]] (*Chandler*)
|
|
CROSSREFS
|
Cf. A128191.
Sequence in context: A125666 A111678 A101819 this_sequence A077750 A076393 A054674
Adjacent sequences: A128189 A128190 A128191 this_sequence A128193 A128194 A128195
|
|
KEYWORD
|
frac,nonn
|
|
AUTHOR
|
Leroy Quet (qq-quet(AT)mindspring.com), Feb 17 2007
|
|
EXTENSIONS
|
Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Feb 26 2007
|
|
|
Search completed in 0.002 seconds
|
