OFFSET
1,2
COMMENTS
EXAMPLE
For n = 9 the symmetric representation of sigma(9) = 13 in the first quadrant looks like this:
y
.
._ _ _ _ _ 5
|_ _ _ _ _|
. |_ _ 3
. |_ |
. |_|_ _ 5
. | |
. | |
. | |
. | |
. . . . . . . . |_| . . x
.
There are three parts [5, 3, 5] and the largest part is 5 so a(9) = 5.
For n = 45 the symmetric representation of sigma(45) = 78 has three parts [23, 32, 23] and the largest part is 32 so a(45) = 32.
MATHEMATICA
(* Function a237270[] is defined in A237270 *)
a241559[n_]:=Max[a237270[n]]
Map[a241559, Range[64]] (* data *)
(* Hartmut F. W. Hoft, Sep 19 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus and Omar E. Pol, Apr 29 2014
STATUS
approved