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A114743 a(1) =4, a(2) = 6, a(n+1) = least composite number of the form k*(a(n-1)) - a(n), not included earlier. 3
4, 6, 10, 8, 12, 20, 16, 24, 40, 32, 48, 80, 64, 96, 160, 128, 192, 320, 256, 384, 640, 512, 768, 1280, 1024, 1536, 2560, 2048, 3072, 5120, 4096, 6144, 10240, 8192, 12288, 20480, 16384, 24576, 40960, 32768, 49152, 81920, 65536, 98304, 163840, 131072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(3n+1) = 2*a(3n-2)= 2^(n+2). a(3n+2) = 2*a(3n-1). = 3*2^(n+1). a(3n+3) = 2*a(3n). =5*2^(n).

LINKS

Table of n, a(n) for n=1..46.

FORMULA

a(n)=2*a(n-3). G.f.: -2*x*(2+3*x+5*x^2)/(-1+2*x^3). a(n)=2*A114744(n+1). [From R. J. Mathar, Jul 07 2009]

CROSSREFS

Sequence in context: A115655 A084350 A028279 * A089546 A263483 A249982

Adjacent sequences:  A114740 A114741 A114742 * A114744 A114745 A114746

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 15 2005

EXTENSIONS

More terms from R. J. Mathar, Jul 07 2009

STATUS

approved

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Last modified July 8 00:40 EDT 2020. Contains 335502 sequences. (Running on oeis4.)