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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A239877 Numbers k that divide A239876(k).

Original entry on oeis.org

1, 2, 6, 14, 23, 93, 95, 343, 1924, 13358, 27385, 54709, 150554, 445242, 581211, 589819, 14733535, 18859421, 19861702, 371619757, 775908129, 1076759948, 1083679128, 7402437933, 42679464436
Offset: 1

Views

Author

Jaroslav Krizek, Mar 29 2014

Keywords

Comments

Values of k for which A239876(k) / k is an integer.
A239876 = partial sums of A229110 where A229110(n) = antisigma(n) mod n = A024816(n) mod n.
a(26) > 3*10^11. - Giovanni Resta, Mar 29 2014

Examples

			a(4) = 14 is in the sequence because A239876(14) / 14 = 70 / 14 = 5 is an integer.

Crossrefs

Cf. A024816, A229110, A239876.

Programs

  • Magma
    [n: n in [1..1000] | u eq 0 where u is ((&+[(k*(k+1)div 2 - SumOfDivisors (k)) mod k: k in [1..n]]) mod n)]

Extensions

a(13)-a(25) 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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