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A152864 Deficiency of n, plus the number of proper divisors of n: a(n) = 2n - sigma(n) + d(n) - 1. 3

%I

%S 1,2,3,3,5,3,7,4,7,5,11,1,13,7,9,5,17,2,19,3,13,11,23,-5,21,13,17,5,

%T 29,-5,31,6,21,17,25,-11,37,19,25,-3,41,-5,43,9,17,23,47,-19,43,12,33,

%U 11,53,-5,41,-1,37,29,59,-37,61,31

%N Deficiency of n, plus the number of proper divisors of n: a(n) = 2n - sigma(n) + d(n) - 1.

%F a(n) = A005843(n)-A000203(n)+A000005(n)-1 = A033879(n)+A032741(n).

%Y Cf. A000005, A000203, A005843, A032741, A033879, A152770, A152771, A152772.

%K easy,sign

%O 1,2

%A _Omar E. Pol_, Dec 14 2008

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Last modified June 20 12:54 EDT 2021. Contains 345164 sequences. (Running on oeis4.)