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!)
A084301 a(n) = sigma(n) mod 6. 25
1, 3, 4, 1, 0, 0, 2, 3, 1, 0, 0, 4, 2, 0, 0, 1, 0, 3, 2, 0, 2, 0, 0, 0, 1, 0, 4, 2, 0, 0, 2, 3, 0, 0, 0, 1, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 4, 3, 3, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 1, 0, 0, 2, 0, 0, 0, 0, 3, 2, 0, 4, 2, 0, 0, 2, 0, 1, 0, 0, 2, 0, 0, 0, 0, 0, 0, 4, 0, 2, 0, 0, 0, 2, 3, 0, 1, 0, 0, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

Index entries for sequences related to sums of divisors

FORMULA

a(n) = A010875(A000203(n)). - Antti Karttunen, Nov 07 2017

MAPLE

A084301:= n-> (numtheory[sigma](n) mod 6):

seq (A084301(n), n=1..105); # Jani Melik, Jan 26 2011

MATHEMATICA

Table[Mod[DivisorSigma[1, n], 6], {n, 120}]  (* Harvey P. Dale, Apr 07 2011 *)

PROG

(PARI) a(n)=sigma(n)%6 \\ Charles R Greathouse IV, Mar 09 2014

CROSSREFS

Cf. A000203, A010875, A054763, A084299, A084300.

Sequences sigma(n) mod k: A053866 (k=2), A074941 (k=3), A105824 (k=4), A105825 (k=5), A084301 (k=6), A105826 (k=7), A105827 (k=8).

Cf. A074627 (locations of 0), A074628 (locations of 2), A067051 (locations of 3), A074630 (locations of 4), A074384 (locations of 5).

Sequence in context: A102222 A171657 A287696 * A195788 A201930 A176979

Adjacent sequences:  A084298 A084299 A084300 * A084302 A084303 A084304

KEYWORD

easy,nonn

AUTHOR

Labos Elemer, Jun 02 2003

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 March 1 02:43 EST 2021. Contains 341732 sequences. (Running on oeis4.)