|
Search: id:A140434
|
|
|
| A140434 |
|
Number of new visible points created at each step in an n X n grid. |
|
+0
7
|
|
| 1, 2, 4, 4, 8, 4, 12, 8, 12, 8, 20, 8, 24, 12, 16, 16, 32, 12, 36, 16, 24, 20, 44, 16, 40, 24, 36, 24, 56, 16, 60, 32, 40, 32, 48, 24, 72, 36, 48, 32, 80, 24, 84, 40, 48, 44, 92, 32, 84, 40, 64, 48, 104, 36, 80, 48, 72, 56, 116, 32, 120
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Equals row sums of triangle A143467 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 17 2008]
Equals first difference row of A018805: (1, 3, 7, 11, 19, 23, 35,...). [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 17 2008]
|
|
MATHEMATICA
|
f[n_] := FoldList[Plus, 1, 2 Array[EulerPhi, n, 2]] - Most[Flatten[ Append[{0}, FoldList[Plus, 1, 2 Array[EulerPhi, n, 2]]]]]
|
|
CROSSREFS
|
Cf. A018805, A100613, A140435.
Adjacent sequences: A140431 A140432 A140433 this_sequence A140435 A140436 A140437
Sequence in context: A117215 A011173 A131136 this_sequence A107748 A005884 A079890
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Gregg Whisler (gkwhisler(AT)msn.com), Jun 25 2008, Jun 28 2008
|
|
|
Search completed in 0.002 seconds
|
