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A162196 Sum of proper divisors minus the number of proper divisors of nonprime number A018252(n). 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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).

LINKS

Table of n, a(n) for n=1..64.

FORMULA

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

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

MAPLE

A162196 := proc(n)

        A152770(A018252(n)) ;

end proc: # R. J. Mathar, Sep 28 2011

CROSSREFS

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

Sequence in context: A275848 A214929 A205152 * A179297 A133620 A154570

Adjacent sequences:  A162193 A162194 A162195 * A162197 A162198 A162199

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Jul 04 2009

STATUS

approved

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Last modified December 11 06:43 EST 2016. Contains 279041 sequences.