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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: A363248 A084350 A028279 * A089546 A263483 A363700 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 September 9 20:03 EDT 2024. Contains 375765 sequences. (Running on oeis4.)