A239869 Numbers k that divide A239868(k).

1, 6, 7, 9, 14, 21, 37, 69, 670, 3471, 3477, 5160, 9500, 15432, 67054, 302224, 791733, 861781, 1425779, 6242689, 71511220, 187308565, 318733908, 336841318, 343858368, 499742949, 4088136488, 4172097579, 9981207398

Offset

1,2

Comments

A239868 = partial sums of A054024, where A054024(n) = sigma(n) mod n.

Values of k for which A239868(k) / k is an integer.

a(30) > 3*10^11. - Giovanni Resta, Mar 29 2014

Links

Table of n, a(n) for n=1..29.

Example

a(4) = 9 is in the sequence because A239868(9) / 9 = 18 / 9 = 2 is an integer.

Prog

(Magma) [n: n in [1..10000] | u eq 0 where u is ((&+[SumOfDivisors (k) mod k: k in [1..n]]) mod n)]

Crossrefs

Cf. A000203, A054024, A239868.

Sequence in context: A045014 A047591 A340765 * A289547 A329912 A187922

Adjacent sequences: A239866 A239867 A239868 * A239870 A239871 A239872

Keyword

nonn

Author

Jaroslav Krizek, Mar 28 2014

Extensions

a(16)-a(29) from Giovanni Resta, Mar 29 2014

Status

approved