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A193993
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Number of zeros in the period of Fibonacci 4-step sequence A000078 mod n.
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1
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1, 3, 9, 5, 72, 27, 49, 8, 12, 216, 11, 24, 7, 147, 36, 10, 336, 36, 361, 188, 231, 8, 529, 39, 80, 21, 21, 126, 11, 108, 1986, 14, 51, 1008, 636, 31, 34, 1083, 36, 152, 11, 693, 3786, 8, 24, 1587, 2209, 51, 56, 56, 1440, 19, 5832, 63, 33, 203, 1653, 9, 3481
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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n = 4; Table[a = Join[{1}, Table[0, {n - 1}]]; a = Mod[a, i]; a0 = a; k = 0; zeros = 0; While[k++; s = Mod[Plus @@ a, i]; a = RotateLeft[a]; If[s == 0, zeros++]; a[[n]] = s; a != a0]; zeros, {i, 100}]
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CROSSREFS
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Cf. A106295 (period of Lucas 4-step sequence).
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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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