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%I #11 Jan 03 2024 22:04:52
%S 1,2,3,15,24,25
%N The set of exotic numbers A064818 extended by allowing the double factorials A006882 into the set of operations.
%e Using double factorials (!!) augments A064818 for example by 3 = 3!! and by 15 = (5!!)*1 = (5!!)/1 = (5!!)^1.
%Y Cf. A006882, A064818.
%K more,nonn
%O 1,2
%A _Paolo P. Lava_ & _Giorgio Balzarotti_, Jul 16 2009
%E Definition rephrased by _R. J. Mathar_, Aug 27 2009