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A231594
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Total number of 5's digits in primes less than 10^n.
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0
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1, 3, 33, 360, 3816, 38911, 396016, 4015732, 40543671, 408462140, 4109293287, 41296082801, 414669334188, 4161237526152
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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)=3, since there are 3 5's in primes less than 100. Namely: 5, 53, 59.
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MATHEMATICA
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Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 5, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)
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CROSSREFS
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KEYWORD
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more,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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