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A064720 A Beatty sequence for 3^i + 3^-i + 1. 3
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 128, 130, 132, 134 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

3^i + 3^-i + 1 ~= 1.90966484565321951005513028719008497... ~= 21/11.

Different from A059548, although the sequences agree for about 1400 terms. - Joshua Zucker, Apr 25 2007

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..2000

MATHEMATICA

a = Chop[ N[ 3^I + 3^-I +1, 36], 10^-40]; Table[ Floor[n*a/(a-1))], {n, 1, 75} ]

PROG

(PARI) { default(realprecision, 100); b=real(3^I + 3^-I) + 1; b=b/(b - 1); for (n = 1, 2000, write("b064720.txt", n, " ", floor(n*b)) ) } \\ Harry J. Smith, Sep 23 2009

CROSSREFS

Cf. A064719.

Sequence in context: A246414 A054965 A059548 * A029741 A240171 A221284

Adjacent sequences:  A064717 A064718 A064719 * A064721 A064722 A064723

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Oct 13 2001

STATUS

approved

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Last modified June 14 08:09 EDT 2021. Contains 345018 sequences. (Running on oeis4.)