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A294028 Composite numbers n such that  n | 1 - A078712(n). 0
49, 77, 121, 203, 319, 413, 679, 721, 749, 841, 869, 1057, 1211, 1351, 1393, 1397, 1441, 1639, 1687, 1757, 1769, 1883, 2167, 2189, 2219, 2359, 2429, 2581, 2651, 2761, 2959, 3031, 3073, 3101, 3227, 3409, 3437, 3485, 3487, 3563, 3899, 4037, 4039, 4109, 4279 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A018187 (restricted Perrin pseudoprimes) is the intersection of A013998 (unrestricted Perrin pseudoprimes) with this sequence.

LINKS

Table of n, a(n) for n=1..45.

William Adams and Daniel Shanks, Strong primality tests that are not sufficient, Math. Comp. 39 (1982), 255-300.

MATHEMATICA

a={}; b=-Drop[CoefficientList[Series[(2x+3)/(x^3-x-1), {x, 0, 10^4}], x] , 1];

Do[If[!PrimeQ[k]&&Divisible[b[[k]]+1, k], AppendTo[a, k]], {k, 2, Length[b]}]; a

CROSSREFS

Cf. A001608, A013998, A018187, A078712.

Sequence in context: A063163 A103216 A036307 * A056938 A267986 A207638

Adjacent sequences:  A294025 A294026 A294027 * A294029 A294030 A294031

KEYWORD

nonn

AUTHOR

Amiram Eldar, Oct 22 2017

STATUS

approved

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Last modified February 17 23:47 EST 2018. Contains 299297 sequences. (Running on oeis4.)