The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A105825 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A105825

a(n) = sigma(n) (mod 5).
(history; published version)

#13 by Susanna Cuyler at Tue Nov 07 18:31:24 EST 2017

STATUS

proposed

approved

#12 by Michel Marcus at Tue Nov 07 12:37:39 EST 2017

STATUS

editing

proposed

#11 by Michel Marcus at Tue Nov 07 12:37:35 EST 2017

MAPLE

seq (A105825(n), n=1..105); # - _Jani Melik, _, Jan 26 2011

STATUS

proposed

editing

#10 by Antti Karttunen at Tue Nov 07 12:36:47 EST 2017

STATUS

editing

proposed

#9 by Antti Karttunen at Tue Nov 07 12:32:27 EST 2017

NAME

Sigmaa(n) = sigma(n) (mod 5).

LINKS

Antti Karttunen, <a href="/A105825/b105825.txt">Table of n, a(n) for n = 1..16384</a>

<a href="/index/Su#sums_of_divisors">Index entries for sequences related to sums of divisors</a>

CROSSREFS

Cf. A000203.

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).

STATUS

approved

editing

#8 by Harvey P. Dale at Thu Oct 03 17:27:43 EDT 2013

STATUS

editing

approved

#7 by Harvey P. Dale at Thu Oct 03 17:27:33 EDT 2013

MATHEMATICA

Mod[DivisorSigma[1, Range[110]], 5] (* Harvey P. Dale, Oct 03 2013 *)

STATUS

approved

editing

#6 by Charles R Greathouse IV at Wed Oct 02 15:47:26 EDT 2013

AUTHOR

_Shyam Sunder Gupta (guptass(AT)rediffmail.com), _, May 05 2005

Discussion

Wed Oct 02

15:47

OEIS Server: https://oeis.org/edit/global/1962

#5 by Alois P. Heinz at Tue Jan 25 19:36:44 EST 2011

STATUS

proposed

approved

#4 by Alois P. Heinz at Tue Jan 25 19:36:35 EST 2011

MAPLE

A105825:= (n-> (numtheory[sigma](n) mod 5):

STATUS

approved

proposed