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A074461
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Average digit (rounded down) in the decimal expansion of the n-th prime number.
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4
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2, 3, 5, 7, 1, 2, 4, 5, 2, 5, 2, 5, 2, 3, 5, 4, 7, 3, 6, 4, 5, 8, 5, 8, 8, 0, 1, 2, 3, 1, 3, 1, 3, 4, 4, 2, 4, 3, 4, 3, 5, 3, 3, 4, 5, 6, 1, 2, 3, 4, 2, 4, 2, 2, 4, 3, 5, 3, 5, 3, 4, 4, 3, 1, 2, 3, 2, 4, 4, 5, 3, 5, 5, 4, 6, 4, 6, 6, 1, 4, 4, 2, 2, 3, 5, 3, 5, 5, 3, 4
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, ... so the average digits rounded down are; 2, 3, 5, 7, (1+1)/2 = 1, (1+3)/2 = 2, (1+7)/2 = 4, (1+9)/2 = 5, floor((2+3)/2) = 2, ...
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PROG
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(PARI) a(n)={my(v=digits(prime(n))); vecsum(v)\#v} \\ Andrew Howroyd, Jan 16 2020
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 23 2002
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EXTENSIONS
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Offset corrected and terms a(21) and beyond from Andrew Howroyd, Jan 16 2020
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STATUS
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approved
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