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A154130 Exponents m with decreasing fractional part of (4/3)^m. 58
1, 4, 13, 17, 128, 485, 692, 1738, 12863, 77042, 109705, 289047, 720429, 4475944, 75629223, 182575231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The next term is greater than 3*10^8.

LINKS

Table of n, a(n) for n=1..16.

FORMULA

Recursion: a(1):=1, a(k):=min{ m>1 | fract((4/3)^m) < fract((4/3)^a(k-1))}, where fract(x) = x-floor(x).

EXAMPLE

a(3)=13, since fract((4/3)^13)=0.0923.., but fract((4/3)^k)>=0.16... for 1<=k<=12; thus fract((4/3)^13)<fract((4/3)^k) for 1<=k<13.

CROSSREFS

Cf. A081464, A153669, A153701, A153708, A154138, A154146.

Cf. A002379, A064628.

Sequence in context: A280385 A190122 A042713 * A041407 A252976 A065564

Adjacent sequences:  A154127 A154128 A154129 * A154131 A154132 A154133

KEYWORD

nonn

AUTHOR

Hieronymus Fischer, Jan 11 2009

EXTENSIONS

Extended by Charles R Greathouse IV, Nov 03 2009

a(15)-a(16) from Robert Gerbicz, Nov 21 2010

STATUS

approved

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Last modified October 22 14:44 EDT 2019. Contains 328318 sequences. (Running on oeis4.)