|
|
A109214
|
|
Product of a(n-1) and digit reversal of a(n-2).
|
|
2
|
|
|
1, 2, 2, 4, 8, 32, 256, 5888, 3838976, 34109301760, 231888097227054080, 1556059601911449331359933440, 125186119679477750610733678211850458005934080, 55507466796083630515105997822341552764197877620395801846452095434158080
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
The next term (a(15)) has 115 digits. [From Harvey P. Dale, Nov 14 2011]
|
|
LINKS
|
|
|
FORMULA
|
a(n)=a(n-1)*R(a(n-2)).
|
|
MATHEMATICA
|
a[1]=1; a[2]=2; a[n_]:=a[n]=a[n-1]*FromDigits[Reverse[IntegerDigits[a[n-2]]]]; A109214=Table[a[n], {n, 13}]
Transpose[NestList[{Last[#], Last[#]FromDigits[Reverse[ IntegerDigits[ First[ #]]]]}&, {1, 2}, 13]][[1]] (* Harvey P. Dale, Nov 14 2011 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
One more term (a(14)) from Harvey P. Dale, Nov 14 2011
|
|
STATUS
|
approved
|
|
|
|