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A024623
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a(n) is the number of prime powers <= 3^n.
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2
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1, 3, 8, 16, 33, 69, 153, 360, 894, 2294, 6060, 16229, 44126, 121021, 334771, 931905, 2608160, 7333717, 20703268, 58652234, 166684333, 475034096, 1357217584, 3886575564, 11152863757, 32065004164, 92349161271, 266398439961, 769616851854, 2226457643329, 6449248612381, 18703413267318
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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