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A038470
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Sums of 2 distinct powers of 4.
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6
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5, 17, 20, 65, 68, 80, 257, 260, 272, 320, 1025, 1028, 1040, 1088, 1280, 4097, 4100, 4112, 4160, 4352, 5120, 16385, 16388, 16400, 16448, 16640, 17408, 20480, 65537, 65540, 65552, 65600, 65792, 66560, 69632, 81920, 262145, 262148, 262160, 262208, 262400, 263168
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Sort[Plus @@@ Subsets[4^Range[0, 9], {2}]] (* Amiram Eldar, Jul 13 2022 *)
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PROG
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(Python)
def aupto(limit):
p = [4**i for i in range(limit//4+1) if 4**i < limit]
p2 = set(a+b for i, a in enumerate(p) for b in p[i+1:] if a+b <= limit)
return sorted(p2)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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