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!)
A050455 a(n) = Sum_{d|n, d=3 mod 4} d^4. 1
0, 0, 81, 0, 0, 81, 2401, 0, 81, 0, 14641, 81, 0, 2401, 50706, 0, 0, 81, 130321, 0, 2482, 14641, 279841, 81, 0, 0, 531522, 2401, 0, 50706, 923521, 0, 14722, 0, 1503026, 81, 0, 130321, 2313522, 0, 0, 2482, 3418801, 14641, 50706, 279841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

MATHEMATICA

a[n_] := DivisorSum[n, #^4 &, Mod[#, 4]==3 &]; Array[a, 30] (* Amiram Eldar, Dec 06 2018 *)

CROSSREFS

Sequence in context: A116230 A056669 A005085 * A110727 A005068 A259687

Adjacent sequences:  A050452 A050453 A050454 * A050456 A050457 A050458

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 23 1999

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 26 08:06 EDT 2020. Contains 338027 sequences. (Running on oeis4.)