Sha256: b6760facab9818e6f3d27785a0036677c3053409ff1fd07ff8395d8c38ad43b8
Contents?: true
Size: 243 Bytes
Versions: 6
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Stored size: 243 Bytes
Contents
class Integer
def fibonacci?
return true if self == 1
# Posamentier, Alfred; Lehmann, Ingmar (2007). The (Fabulous) FIBONACCI
# Numbers. Prometheus Books. pp. 305
[4, -4].map{|x| (5 * (self**2)) + x}.any? &:square?
end
end
Version data entries
6 entries across 6 versions & 1 rubygems