Returns True if nside is a valid nside parameter, False otherwise.
Parameters : | nside : int, scalar or array-like
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Returns : | ok : bool, scalar or array-like
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Examples
>>> import healpy as hp
>>> hp.isnsideok(13)
False
>>> hp.isnsideok(32)
True
>>> hp.isnsideok([1, 2, 3, 4, 8, 16])
array([ True, True, False, True, True, True], dtype=bool)