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!)
A066363 The floor[n^(3/4)]-perfect numbers, where f-perfect numbers for an arithmetical function f is defined in A066218. 1
2, 4, 8, 10, 16, 98, 236, 244, 268, 284, 292, 316, 332, 638, 2198, 2282, 2338, 2422, 2674, 4653, 12274, 30753, 65018, 225267, 231478, 289605, 376995, 422684, 449756, 453092, 515175, 521925, 522825, 524325, 527025, 527925, 528225, 534075, 538275, 539025, 540975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..268

J. Pe, On a Generalization of Perfect Numbers, J. Rec. Math., 31(3) (2002-2003), 168-172.

MATHEMATICA

f[x_] := Floor[ x^(3/4)]; Select[ Range[ 2, 10^4], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ]

CROSSREFS

Cf. A066218.

Sequence in context: A177050 A276772 A173063 * A122636 A095726 A322375

Adjacent sequences:  A066360 A066361 A066362 * A066364 A066365 A066366

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Dec 20 2001

EXTENSIONS

a(21)-a(41) from Amiram Eldar, Sep 26 2019

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 October 23 14:42 EDT 2021. Contains 348214 sequences. (Running on oeis4.)