|
|
A038045
|
|
Shifts left under transform T where Ta is phi DCONV a.
|
|
7
|
|
|
1, 1, 2, 4, 7, 11, 17, 23, 33, 43, 58, 68, 97, 109, 138, 168, 211, 227, 298, 316, 401, 459, 537, 559, 723, 771, 892, 988, 1173, 1201, 1507, 1537, 1791, 1947, 2190, 2324, 2825, 2861, 3195, 3437, 3999, 4039, 4794, 4836, 5481, 5971, 6552, 6598, 7775
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
a(1) = 1; a(n+1) = Sum_{d|n} phi(n/d) * a(d). - Ilya Gutkovskiy, Feb 23 2020
|
|
MATHEMATICA
|
a[1] = 1; a[n_] := a[n] = Sum[EulerPhi[(n-1)/d]*a[d], {d, Divisors[n-1]}]; Table[a[n], {n, 1, 100}] (* Vaclav Kotesovec, Feb 23 2020 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,eigen
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|