|
| |
|
|
A076160
|
|
Sod_4 - sod_3 + sod_2 - sod_1, where sod_k is the sum of k-th powers of digits of n.
|
|
0
| |
|
|
0, 0, 10, 60, 204, 520, 1110, 2100, 3640, 5904, 0, 0, 10, 60, 204, 520, 1110, 2100, 3640, 5904, 10, 10, 20, 70, 214, 530, 1120, 2110, 3650, 5914, 60, 60, 70, 120, 264, 580, 1170, 2160, 3700, 5964, 204, 204, 214, 264, 408, 724, 1314, 2304, 3844, 6108
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| A quasiperiodic function.
|
|
|
FORMULA
| Sod_4 - sod_3 + sod_2 - sod_1 = sum(d(d-1)(d^2+1)), d's are digits of n
|
|
|
EXAMPLE
| a(4) = 204 = 4(4-1)(4^2+1), a(5) = 520 = 5(5-1)(5^2+1).
|
|
|
MATHEMATICA
| sod[n_]:=Module[{idn=IntegerDigits[n]}, Total[Total/@{-idn+idn^2-idn^3+idn^4}]]; Array[sod, 50, 0] (* From Harvey P. Dale, Sep 20 2011 *)
|
|
|
CROSSREFS
| Sequence in context: A065641 A121874 A144560 * A004406 A003472 A112502
Adjacent sequences: A076157 A076158 A076159 * A076161 A076162 A076163
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Nov 01 2002
|
| |
|
|
