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a(n) = A072905(n) - A006255(n).
2

%I #18 Mar 23 2015 14:17:25

%S 3,2,4,5,10,12,14,3,7,22,22,7,26,35,36,9,34,5,38,15,56,55,46,22,11,65,

%T 13,23,58,78,62,5,88,85,92,13,74,95,104,40,82,112,86,44,20,115,94,21,

%U 15,9,136,52,106,26,154,54,152,145,118,60,122,155,35,17

%N a(n) = A072905(n) - A006255(n).

%C a(n) is strictly nonnegative because A072905 is an upper bound on A006255.

%C A066400(n) = 2 if and only if a(n) = 0.

%C a(n) > 0 for all n <= 10000.

%H Peter Kagey, <a href="/A255167/b255167.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A072905(n) - A006255(n).

%Y Cf. A072905, A006255, A066400.

%K nonn

%O 1,1

%A _Peter Kagey_, Feb 15 2015