1,1
See A067441 for an example when the number is even.
Odd terms in A064771 (a unique subset of proper divisors sums to the number).
Cf. A136446.
Adjacent sequences: A065232 A065233 A065234 this_sequence A065236 A065237 A065238
Sequence in context: A115427 A043524 A037192 this_sequence A087167 A034589 A106770
nonn
Jud McCranie (j.mccranie(AT)comcast.net), Oct 23 2001
Definition clarified by M. F. Hasler, Apr 08 2008
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