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A180597 Digital root of 7n. 7
0, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8, 6, 4, 2, 9, 7, 5, 3, 1, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Period of 9. - Robert G. Wilson v, Sep 20 2010

LINKS

Table of n, a(n) for n=0..104.

MATHEMATICA

f[n_] := Mod[7 n - 1, 9] + 1; f[0] = 0; Array[f, 105, 0] (* Robert G. Wilson v, Sep 20 2010 *)

PROG

(PARI) a(n)=7*n%9 \\ Charles R Greathouse IV, Aug 22 2014

CROSSREFS

Cf. A007953, A010888, A180592, A180594, A180595, A180596, A180592, A180593, A180594, A180595, A180596, A180598, A180599.

Sequence in context: A106040 A320158 A085927 * A219242 A330920 A155816

Adjacent sequences:  A180594 A180595 A180596 * A180598 A180599 A180600

KEYWORD

easy,nonn,base

AUTHOR

Odimar Fabeny, Sep 10 2010

EXTENSIONS

More terms from Robert G. Wilson v, Sep 20 2010

STATUS

approved

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Last modified January 26 19:45 EST 2021. Contains 340442 sequences. (Running on oeis4.)