A193993 - OEIS

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A193993

Number of zeros in the period of Fibonacci 4-step sequence A000078 mod n.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

MATHEMATICA

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}]

CROSSREFS

Cf. A106295 (period of Lucas 4-step sequence).

Sequence in context: A122943 A276148 A182946 * A107051 A351913 A337446

Adjacent sequences: A193990 A193991 A193992 * A193994 A193995 A193996

KEYWORD

nonn

AUTHOR

T. D. Noe, Aug 18 2011

STATUS

approved