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.

A218405 Numbers k for which sigma(k)/k - 3/4 is an integer.

Original entry on oeis.org

4, 47616, 293760, 1782144, 3485664, 134209536, 282977280, 746444160, 1459956960, 1684126080, 1716728832, 27298252800, 41233360896, 376591138560, 719045268480, 1622308746240, 38965526046720, 41769966551040, 985261739212800, 3067660098994176
Offset: 1

Views

Author

Zdenek Cervenka, Oct 28 2012

Keywords

Comments

a(14) > 10^11. - Donovan Johnson, Oct 31 2012
a(16) > 10^12. - Giovanni Resta, Nov 04 2012

Crossrefs

Cf. A218404, A159907.

Extensions

a(6)-a(13) from Donovan Johnson, Oct 31 2012
a(14)-a(15) from Giovanni Resta, Nov 04 2012
More terms from Michel Marcus, Jun 26 2013

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