cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A239869 Numbers k that divide A239868(k).

Original entry on oeis.org

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

Views

Author

Jaroslav Krizek, Mar 28 2014

Keywords

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

Examples

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

Crossrefs

Cf. A000203, A054024, A239868.

Programs

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

Extensions

a(16)-a(29) from Giovanni Resta, Mar 29 2014
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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