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Search: id:A140435
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| A140435 |
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Number of new lattice points created at each step in an n X n grid that are not visible. |
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+0
2
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| 0, 1, 1, 3, 1, 7, 1, 7, 5, 11, 1, 15, 1, 15, 13, 15, 1, 23, 1, 23, 17, 23, 1, 31, 9, 27, 17, 31, 1, 43, 1
(list; graph; listen)
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OFFSET
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1,4
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MATHEMATICA
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g[n_] := Table[ #^2 &[m], {m, 1, n + 1}] - FoldList[Plus, 1, 2 Array[EulerPhi, n, 2]] - Most[Flatten[ Append[{0}, Table[ #^2 &[m], {m, 1, n + 1}] - FoldList[Plus, 1, 2 Array[EulerPhi, n, 2]]]]]
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CROSSREFS
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Cf. A018805, A100613 and A140434.
Sequence in context: A065745 A117677 A038870 this_sequence A063754 A163117 A099749
Adjacent sequences: A140432 A140433 A140434 this_sequence A140436 A140437 A140438
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KEYWORD
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nonn
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AUTHOR
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Gregg Whisler (gkwhisler(AT)msn.com), Jun 25 2008
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