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 A069105 1/n has period 3 in base 10. 6
 27, 37, 54, 74, 108, 111, 135, 148, 185, 216, 222, 270, 296, 333, 370, 432, 444, 540, 555, 592, 666, 675, 740, 864, 888, 925, 999, 1080, 1110, 1184, 1332, 1350, 1480, 1665, 1728, 1776, 1850, 1998, 2160, 2220, 2368, 2664, 2700, 2775, 2960, 3330, 3375, 3456, 3552, 3700, 3996, 4320, 4440, 4625, 4736, 4995 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Ray Chandler, Table of n, a(n) for n = 1..348 FORMULA Numbers of the form a*b*c where a is in {27, 37, 111, 333, 999}, b is a power of 2 and c is a power of 5. - Henry Bottomley, Apr 12 2002 Equivalently: A132740(n) divides 999 but does not divide 9. - M. F. Hasler, Apr 25 2017 EXAMPLE 1/1332 = 0.000750750750... MATHEMATICA Select[ Range[7500], Length[ RealDigits[1/# ] [[1, -1]]] == 3 &] PROG (PARI) is(n, S=[27, 37, 111, 333, 999])=setsearch(S, n\5^valuation(n, 5)>>valuation(n, 2)) \\ M. F. Hasler, Apr 25 2017 CROSSREFS Cf. A018766, A003592, A070021, A070022, A070023. Sequence in context: A266963 A180961 A278643 * A159259 A097228 A039614 Adjacent sequences:  A069102 A069103 A069104 * A069106 A069107 A069108 KEYWORD base,easy,nonn AUTHOR Joshua Horowitz (mccartneyman(AT)yahoo.com), Apr 07 2002 EXTENSIONS Extended by Robert G. Wilson v, Apr 07 2002 Terms added and program corrected to agree with description by Ray Chandler, Apr 17 2017 STATUS approved

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Last modified October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)