|
Search: id:A034690
|
|
|
| A034690 |
|
Sum of digits of all the divisors of n. |
|
+0
10
|
|
| 1, 3, 4, 7, 6, 12, 8, 15, 13, 9, 3, 19, 5, 15, 15, 22, 9, 30, 11, 15, 14, 9, 6, 33, 13, 15, 22, 29, 12, 27, 5, 27, 12, 18, 21, 46, 11, 24, 20, 27, 6, 33, 8, 21, 33, 18, 12, 52, 21, 21, 18, 26, 9, 48, 18, 48, 26, 27, 15, 42, 8, 15, 32, 37, 21, 36, 14, 36, 24, 36, 9, 69, 11, 24, 34
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
First occurrence of k, or 0 if k never appears: 1, 0, 2, 3, 13, 5, 4, 7, 10, 0, 19, 6, 9, 21, 8, 403, 79, 34, 12, 39, 35, 16, 129, 38, 133, 52, 30, 100, 28, 18, 81, 63, 24, 75, 333, 66, 64, 117, 99, 243, ..., . Robert G. Wilson v
Numbers k for which there is no a(): {2, 10} with 1834 being the first one in question. - Robert G. Wilson v
|
|
MAPLE
|
with(numtheory); read transforms; f:=proc(n) local t1, t2, i; t1:=divisors(n); t2:=0; for i from 1 to nops(t1) do t2:=t2+digsum(t1[i]); od: t2; end;
|
|
MATHEMATICA
|
Table[Plus @@ Flatten@ IntegerDigits@ Divisors@n, {n, 75}] (* Robert G. Wilson v Sep 30 2006 *)
|
|
CROSSREFS
|
Cf. A000005, A086793.
Sequence in context: A107749 A093811 A088000 this_sequence A069192 A076887 A140782
Adjacent sequences: A034687 A034688 A034689 this_sequence A034691 A034692 A034693
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Erich Friedman (erich.friedman(AT)stetson.edu)
|
|
|
Search completed in 0.002 seconds
|
