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.

A218411 Numbers k for which sigma(k)/k - 4/7 is an integer.

Original entry on oeis.org

280, 18620, 411264, 804384, 871416, 1222144, 1284192, 164989440, 270138960, 318729600, 326781000, 396168192, 481572000, 623397600, 675347400, 995248800, 3444711424, 4426793280, 307030348800, 465036042240, 880719036120
Offset: 1

Views

Author

Zdenek Cervenka, Oct 28 2012

Keywords

Comments

a(19) > 10^11. - Donovan Johnson, Oct 31 2012
a(22) > 10^12. - Giovanni Resta, Nov 04 2012

Crossrefs

Cf. A218428, A218409, A218410, A218412, A218413.

Extensions

a(8)-a(18) from Donovan Johnson, Oct 31 2012
a(19)-a(21) from Giovanni Resta, Nov 04 2012

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