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.

A218408 Numbers k for which sigma(k)/k - 3/5 is an integer.

Original entry on oeis.org

15, 90, 3360, 2618880, 5059200, 4873497600, 7381524480, 27990144000, 57846297600, 4609292688000, 4440104532864000, 106644933787392000, 164741543366400000, 454310107592140800, 1084892424295680000, 1160492902900531200, 10932800808939609600
Offset: 1

Views

Author

Zdenek Cervenka, Oct 28 2012

Keywords

Comments

a(10) > 10^11. - Donovan Johnson, Oct 31 2012
a(10) > 10^12. - Giovanni Resta, Nov 04 2012

Crossrefs

Cf. A218406, A218407, A218427.

Extensions

a(6)-a(9) from Donovan Johnson, Oct 31 2012
More terms from Michel Marcus, Jun 26 2013

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