login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216058 Greater of friendly pairs where both terms belong to A014574. 1
600, 1488, 19890, 69030, 77688, 153888, 175392, 204750, 263400, 296478, 328848, 373230, 385392, 397152, 402528, 450600, 510048, 523488, 609600, 632352, 710910, 965400, 1101672, 1109400, 1128600, 1163232, 1206768, 1251432, 1318410, 1393938, 1423968, 1427400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

In the uploaded table, only 2 instances are primitive friendly: {1488, 270} and {52717500, 2418000}.

LINKS

Michel Marcus, Table of n, a(n) for n = 1..1000

Michel Marcus, The friendly pairs

EXAMPLE

600 is in the sequence, because 600 and 240 belong to A014574 and sigma(600)/600 = sigma(240)/240 = 31/10.

CROSSREFS

Cf. A014574.

Sequence in context: A261701 A172244 A090222 * A157918 A092183 A048530

Adjacent sequences:  A216055 A216056 A216057 * A216059 A216060 A216061

KEYWORD

nonn

AUTHOR

Michel Marcus, Aug 31 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 8 14:52 EDT 2020. Contains 333314 sequences. (Running on oeis4.)