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A162599
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Sum of digits (bits) in base two representation of 3^(2^n).
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0
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2, 2, 3, 6, 11, 26, 56, 97, 204, 415, 769, 1606, 3268, 6460, 12889, 25915, 52046, 104099, 207000, 416542, 831430, 1662247, 3324374, 6646337, 13292865, 26593542, 53182276, 106364450, 212732814, 425465107, 850887793, 1701801109
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OFFSET
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0,1
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LINKS
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EXAMPLE
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3^(2^2) = 81 = 64 + 16 + 1, so a(2) = 3.
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MAPLE
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a := proc (n) local b2: b2 := convert(3^(2^n), base, 2): add(b2[j], j = 1 .. nops(b2)) end proc: seq(a(n), n = 0 .. 20); # Emeric Deutsch, Jul 21 2009
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PROG
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(J, version 6.0.1)
s=:(+/@|:@#:@ (3x ^ 2x ^ i.))
s 13
(PARI) a(n) = hammingweight(3^(2^n)); \\ Michel Marcus, Mar 03 2019
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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