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A278588 Triangle read by rows: T(p_1,p_2) = maximal period of a decimal fraction (r/s)*(t/u) given that r/s has period p_1 and t/u has period p_2 (1 <= p_1 <= p_2). 2
9, 18, 198, 27, 54, 2997, 36, 396, 108, 39996, 45, 90, 135, 180, 499995, 54, 594, 5994, 3564, 270, 5999994, 63, 126, 189, 252, 315 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

Arnout Jaspers, Megaperiodieke Breuken Maken, Pythagoras, Number 5, April 2016, pp. 26-29.

Arnout Jaspers, Creating Mega-Periodic Fractions (Loose English translation from R. J. Mathar).

EXAMPLE

Triangle begins (read down columns):

...1.....2....3....4....5.....6......7....(p_2)

1..9....18...27...36...45....54.....63

2......198...54..396...90...594....126

3..........2997..108..135..5994....189

4..............39996..180..3564....252

5..................499995...270....315

...

(p_1)

CROSSREFS

Cf. A110807 (diagonal?)

Sequence in context: A222811 A002169 A050685 * A133361 A005400 A134115

Adjacent sequences:  A278585 A278586 A278587 * A278589 A278590 A278591

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Dec 03 2016, based on English translations provided by Arie Bos and R. J. Mathar.

STATUS

approved

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Last modified April 17 03:44 EDT 2021. Contains 343059 sequences. (Running on oeis4.)