|
Search: id:A132629
|
|
|
| A132629 |
|
Sigma(n)/Sum_digits(n) for n such that sigma(n) is divisible by Sum_digits(n). |
|
+0
2
|
|
| 1, 2, 18, 6, 4, 2, 21, 9, 10, 24, 8, 8, 6, 16, 12, 14, 28, 12, 12, 9, 9, 5, 8, 26, 217, 51, 72, 26, 42, 32, 11, 108, 62, 40, 18, 120, 28, 32, 63, 56, 27, 24, 32, 21, 18, 19, 62, 26, 54, 24, 24, 12, 32, 30, 16, 36, 21, 26
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
EXAMPLE
|
n=147 -> sigma(n)=1+3+7+21+49+147=228 Sum_digits(n)=1+4+7=12 -> 228/12 = 19
n=177 -> sigma(n)=1+3+59+177=240 Sum_digits(n)=1+7+7=15 -> 240/15 = 16
|
|
MAPLE
|
with(numtheory); P:=proc(n) local a, i, j, k, w; for i from 1 by 1 to n do w:=0; k:=i; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; j:=sigma(i)/w; if trunc(j)=j then print(j); fi; od; end: P(200);
|
|
CROSSREFS
|
Cf. A007691, A054030, A132628.
Sequence in context: A094048 A087665 A093481 this_sequence A083502 A076378 A066242
Adjacent sequences: A132626 A132627 A132628 this_sequence A132630 A132631 A132632
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Aug 24 2007
|
|
|
Search completed in 0.002 seconds
|
