|
Search: id:A083534
|
|
|
| A083534 |
|
First difference sequence of A007617. Difference between consecutive values not being in the range of phi[A000010]. |
|
+0
1
|
|
| 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 2, 2, 2, 2
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n)=A007617[n+1]-A007617[n]
|
|
EXAMPLE
|
a(n) is either 2 or 1 since odd numbers are in A007619;
if a(n)=1 then A007619[n+1] is an even number not in
range of phi; n={11,13,14,15,17} are not in the range of
phi and the corresponding differences are {2,1,1,2}.
|
|
MATHEMATICA
|
t0[x_] := Table[j, {j, 1, x}] t=Table[EulerPhi[w], {w, 1, 10000}]; u=Union[%]; c=Complement[t0[10000], u]; Delete[c-RotateRight[c], 1]
|
|
CROSSREFS
|
Cf. A000010, A007617, A002202, A005277, A083531-A083536, A005277.
Sequence in context: A087472 A054348 A037813 this_sequence A102300 A087010 A098220
Adjacent sequences: A083531 A083532 A083533 this_sequence A083535 A083536 A083537
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), May 20 2003
|
|
|
Search completed in 0.002 seconds
|
