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A105826
a(n) = sigma(n) (mod 7).
6
1, 3, 4, 0, 6, 5, 1, 1, 6, 4, 5, 0, 0, 3, 3, 3, 4, 4, 6, 0, 4, 1, 3, 4, 3, 0, 5, 0, 2, 2, 4, 0, 6, 5, 6, 0, 3, 4, 0, 6, 0, 5, 2, 0, 1, 2, 6, 5, 1, 2, 2, 0, 5, 1, 2, 1, 3, 6, 4, 0, 6, 5, 6, 1, 0, 4, 5, 0, 5, 4, 2, 6, 4, 2, 5, 0, 5, 0, 3, 4, 2, 0, 0, 0, 3, 6, 1, 5, 6, 3, 0, 0, 2, 4, 1, 0, 0, 3, 2, 0, 4, 6, 6, 0, 3
OFFSET
1,2
MAPLE
A105826:= n-> (numtheory[sigma](n) mod 7):
seq (A105826(n), n=1..105); # Jani Melik, Jan 26 2011
MATHEMATICA
Mod[DivisorSigma[1, Range[110]], 7] (* Harvey P. Dale, Jul 30 2021 *)
PROG
(PARI) a(n)=sigma(n)%7
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).
Sequence in context: A158677 A337164 A105576 * A110665 A063441 A319600
KEYWORD
easy,nonn
AUTHOR
Shyam Sunder Gupta, May 05 2005
STATUS
approved