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1,1
a(n) is strictly nonnegative because A072905 is an upper bound on A006255.
A066400(n) = 2 if and only if a(n) = 0.
a(n) > 0 for all n <= 10000.
Peter Kagey, Table of n, a(n) for n = 1..10000
a(n) = A072905(n) - A006255(n).
Cf. A072905, A006255, A066400.
Sequence in context: A241417 A211363 A059320 * A264993 A280318 A246982
Adjacent sequences: A255164 A255165 A255166 * A255168 A255169 A255170
nonn
Peter Kagey, Feb 15 2015
approved