|
|
A231686
|
|
a(n) = Sum_{i=0..n} digsum_9(i)^3, where digsum_9(i) = A053830(i).
|
|
4
|
|
|
0, 1, 9, 36, 100, 225, 441, 784, 1296, 1297, 1305, 1332, 1396, 1521, 1737, 2080, 2592, 3321, 3329, 3356, 3420, 3545, 3761, 4104, 4616, 5345, 6345, 6372, 6436, 6561, 6777, 7120, 7632, 8361, 9361, 10692, 10756, 10881, 11097, 11440, 11952, 12681, 13681, 15012, 16740, 16865, 17081, 17424, 17936, 18665, 19665, 20996, 22724, 24921, 25137, 25480, 25992, 26721, 27721, 29052
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
P. J. Grabner, P. Kirschenhofer, H. Prodinger, R. F. Tichy, On the moments of the sum-of-digits function, PDF, Applications of Fibonacci numbers, Vol. 5 (St. Andrews, 1992), 263-271, Kluwer Acad. Publ., Dordrecht, 1993.
|
|
MATHEMATICA
|
Accumulate[Table[Total[IntegerDigits[n, 9]]^3, {n, 0, 60}]] (* Harvey P. Dale, Dec 22 2020 *)
|
|
PROG
|
(PARI) a(n) = sum(i=0, n, sumdigits(i, 9)^3); \\ Michel Marcus, Sep 20 2017
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|