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A319771
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Let f(1) = 1, f(2) = 1 + i (where i denotes the imaginary unit), f(3) = 2 + i, and for n > 2, f(n+1) is the Gaussian integer in the first quadrant (with positive real part and nonnegative imaginary part) with least modulus and sharing at least one prime factor with f(n-1) but none with f(n) (in case of a tie, minimize the imaginary part); a(n) = the real part of f(n).
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2
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1, 1, 2, 2, 5, 2, 1, 1, 4, 4, 3, 4, 3, 3, 6, 2, 3, 3, 4, 5, 3, 2, 1, 7, 4, 8, 5, 2, 1, 4, 2, 7, 6, 1, 3, 9, 6, 2, 1, 12, 6, 2, 2, 9, 7, 6, 4, 11, 7, 10, 3, 5, 5, 5, 15, 8, 9, 8, 9, 7, 6, 1, 6, 13, 5, 8, 6, 8, 4, 9, 1, 4, 4, 3, 1, 11, 5, 3, 14, 7, 8, 7, 9, 14
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OFFSET
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1,3
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COMMENTS
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See A319770 for the square of the modulus of f and additional comments.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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