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A089985 a(n)=A089709(n+1)/A089709(n). 4
2, 3, 6, 10, 18, 34, 66, 130, 258, 514, 1026, 2050, 4098, 8194, 16386, 32770, 65538, 131074, 262146, 524290, 1048578, 2097154, 4194306, 8388610, 16777218, 33554434, 67108866, 134217730, 268435458, 536870914, 1073741826, 2147483650 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..2000

FORMULA

a(n) = 2^(n-1)+2, n>2.

MATHEMATICA

Join[{2, 3}, Rest[2^Range[40]+2]] (* Harvey P. Dale, Sep 19 2011 *)

CROSSREFS

Cf. A089709.

Essentially the same as A056469.

Sequence in context: A144026 A054152 A240802 * A191518 A217382 A244742

Adjacent sequences:  A089982 A089983 A089984 * A089986 A089987 A089988

KEYWORD

nonn,easy

AUTHOR

Ray Chandler, Nov 21 2003

STATUS

approved

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Last modified October 22 12:47 EDT 2019. Contains 328318 sequences. (Running on oeis4.)