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A231592
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Total number of 3's digits in primes less than 10^n.
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0
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1, 9, 75, 677, 6229, 58770, 564650, 5472472, 53396224, 523382007, 5148387363, 50778098799, 501864775685, 4968288427006
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(2)=9, since there are 9 3's in primes less than 100. Namely: 3, 13, 23, 31, 37, 43, 53, 73, 83.
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MATHEMATICA
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Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 3, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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