|
| |
|
|
A054012
|
|
Nonzero values of n read modulo (number of proper divisors of n).
|
|
1
|
|
|
|
2, 1, 1, 2, 2, 3, 1, 3, 1, 2, 3, 2, 2, 1, 2, 4, 2, 5, 4, 1, 3, 1, 2, 5, 1, 1, 5, 2, 3, 4, 2, 3, 3, 6, 2, 1, 2, 1, 8, 1, 1, 7, 1, 2, 4, 2, 1, 2, 1, 2, 8, 3, 4, 4, 4, 6, 1, 9, 5, 4, 2, 1, 1, 2, 1, 2, 1, 2, 4, 2, 5, 2, 4, 1, 2, 2, 3, 5, 8, 1, 2, 4, 1, 2, 2, 3, 7, 5, 3, 2, 2, 2, 6, 2, 4, 4, 1, 3, 1, 2, 1, 2, 6, 5, 1
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..105.
|
|
|
FORMULA
|
a(n) = A054011(A054009(n))
|
|
|
MAPLE
|
with(numtheory):
[seq(`if`(i mod (tau(i)-1) <> 0, i mod (tau(i)-1), print( )), i=2..220)];
|
|
|
MATHEMATICA
|
Cases[Table[Mod[n, DivisorSigma[0, n]-1], {n, 2, 200}], Except[0]] (* From Harvey P. Dale, Nov 12 2011 *)
|
|
|
CROSSREFS
|
Cf. A000005, A032741, A054009, A054011.
Sequence in context: A047050 A205028 A057820 * A062083 A133114 A156265
Adjacent sequences: A054009 A054010 A054011 * A054013 A054014 A054015
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Asher Auel (asher.auel(AT)reed.edu) Jan 17, 2000
|
|
|
STATUS
|
approved
|
| |
|
|
