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Also there are some examples with visible and nonvisible lattice points: http://www.jstor.org/pss/2317753 http://www.jstor.org/pss/2686720
Fritz Herzog and B. M. Stewart, Patterns of Visible and Nonvisible Lattice Points, The American Mathematical Monthly, Vol. 78, No. 5 (May, 1971), pp. 487-496 and correction.
Peter Schumer, Strings of Strongly Composite Integers and Invisible Lattice Points, The College Mathematics Journal, Vol. 21, No. 1 (Jan., 1990), pp. 37-40.
Also there are some examples with visible and nonvisible lattice points:
Also there are some examples with visible and nonvisible lattice points: http://www.jstor.org/pss/2317753 http://www.jstor.org/pss/2686720 try to google more examples
