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A277545 a(n) = n/7^m mod 7, where 7^m is the greatest power of 7 that divides n. 1
1, 2, 3, 4, 5, 6, 1, 1, 2, 3, 4, 5, 6, 2, 1, 2, 3, 4, 5, 6, 3, 1, 2, 3, 4, 5, 6, 4, 1, 2, 3, 4, 5, 6, 5, 1, 2, 3, 4, 5, 6, 6, 1, 2, 3, 4, 5, 6, 1, 1, 2, 3, 4, 5, 6, 1, 1, 2, 3, 4, 5, 6, 2, 1, 2, 3, 4, 5, 6, 3, 1, 2, 3, 4, 5, 6, 4, 1, 2, 3, 4, 5, 6, 5, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is the rightmost nonzero digit in the base 7 expansion of n.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A242603(n) mod 7. - Michel Marcus, Oct 20 2016

EXAMPLE

a(9) = (9/7 mod 7) = 2.

MATHEMATICA

Table[Mod[n/7^IntegerExponent[n, 7], 7], {n, 1, 160}]

PROG

(PARI) a(n) = n/7^valuation(n, 7) % 7; \\ Michel Marcus, Oct 20 2016

CROSSREFS

Cf. A010876, A242603.

Sequence in context: A256307 A030998 A255827 * A190596 A053842 A010885

Adjacent sequences:  A277542 A277543 A277544 * A277546 A277547 A277548

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Oct 19 2016

STATUS

approved

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Last modified October 18 23:39 EDT 2019. Contains 328211 sequences. (Running on oeis4.)