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A179267 Numbers n which divide the periodic part (with zeros at end) of the decimal expansion of 1/n. 1
3, 6, 487, 974, 1461, 2435, 2922, 4383, 4870, 7305, 8766, 12175, 13149, 14610, 17532, 21915, 24350, 26298, 29220, 36525, 43830, 48700, 52596, 65745, 73050, 87660, 109575, 131490, 146100, 219150, 262980, 328725, 438300, 657450, 1095750 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There are two definitions of the periodic part: zeros may either begin or end the periodic part. For example, for 1/11 = 0.0909090..., the periodic part could be either 09 or 90. This sequences assumes that the zeros are at the end of the periodic part. See A171928 for the case of zeros at the beginning of the periodic part.

Note that the terms following 487 are divisible by 487. This pattern continues until the prime number 56598313, which is another member of A045616.

LINKS

Table of n, a(n) for n=1..35.

MATHEMATICA

Reap[Do[k=RealDigits[1/n][[1, -1]]; If[Head[k] === List && Mod[FromDigits[k], n] == 0, Sow[n]], {n, 10000}]][[2, 1]]

CROSSREFS

Sequence in context: A068375 A126297 A157540 * A171928 A308259 A034879

Adjacent sequences:  A179264 A179265 A179266 * A179268 A179269 A179270

KEYWORD

base,nonn

AUTHOR

T. D. Noe, Jul 06 2010

STATUS

approved

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Last modified August 9 07:19 EDT 2022. Contains 356019 sequences. (Running on oeis4.)