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A175082 Possible values for sum of perfect divisors of n. 4
1, 2, 3, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Perfect divisor of n is divisor d such that d^k = n for some k >= 1. See A175067 (sum of perfect divisors of n) and A175081 (values taken by the sum of perfect divisors of n (A175067) sorted into ascending order).

Complement of A001597(n+1) for n >= 1 (perfect powers >= 4). a(n) = A007916(n-1) for n >= 2. [From Jaroslav Krizek, Jan 30 2010]

LINKS

Table of n, a(n) for n=1..65.

CROSSREFS

Sequence in context: A028769 A094784 A085971 * A007916 A052485 A341646

Adjacent sequences:  A175079 A175080 A175081 * A175083 A175084 A175085

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Jan 24 2010

STATUS

approved

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Last modified February 26 17:22 EST 2021. Contains 341632 sequences. (Running on oeis4.)