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A231590
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Total number of 1's digits in primes less than 10^n.
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10
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0, 9, 78, 681, 6353, 59634, 570157, 5510645, 53680317, 525651276, 5166809159, 50931212973, 503152799893, 4979293536415
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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 1's in primes less than 100. Namely: 11, 13, 17, 19, 31, 41, 61, 71. Note that 11 counts for two.
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MATHEMATICA
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Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 1, 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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