A152989 -id:A152989 - cp's OEIS frontend

A162196 Sum of proper divisors minus the number of proper divisors of nonprime number A018252(n).

0, 1, 3, 4, 2, 5, 11, 7, 6, 11, 16, 17, 8, 11, 29, 4, 13, 10, 23, 35, 26, 12, 17, 10, 47, 19, 14, 43, 47, 35, 28, 23, 67, 6, 38, 18, 41, 59, 14, 57, 20, 29, 97, 31, 36, 57, 16, 71, 53, 24, 67, 112, 37, 44, 59, 16, 83, 97, 36, 41, 129, 20, 43, 30

Offset: 1

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Omar E. Pol, Jul 04 2009

easy
nonn

Also, zero together with the positive integers of A152770.

Note that the k-th positive integer of this sequence is equal to the sum of proper divisors minus the number of proper divisors of the composite number A002808(k).

Cf. A001065, A018252, A002808, A032741, A152770, A152988, A152989, A152990, A162194, A162195.

A162196 := proc(n)
        A152770(A018252(n)) ;
end proc: # R. J. Mathar, Sep 28 2011

a(n) = A152770(A018252(n)).

a(n) = A001065(A018252(n)) - A032741(A018252(n)).

cp's OEIS Frontend

A162196 Sum of proper divisors minus the number of proper divisors of nonprime number A018252(n).

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