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A074462
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Average digit (rounded up) in the decimal expansion of a prime number.
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1
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2, 3, 5, 7, 1, 2, 4, 5, 3, 6, 2, 5, 3, 4, 6, 4, 7, 4, 7, 4, 5, 8, 6, 9, 8, 1, 2, 3, 4, 2, 4, 2, 4, 5, 5, 3, 5, 4, 5, 4, 6, 4, 4, 5, 6, 7, 2, 3, 4, 5, 3, 5, 3, 3, 5, 4, 6, 4, 6, 4, 5, 5, 4, 2, 3, 4, 3, 5, 5, 6, 4, 6, 6, 5, 7, 5, 7, 7, 2, 5, 5, 3, 3, 4, 6, 4, 6, 6, 4, 5, 6, 7, 7, 5, 8, 3, 5, 3, 4, 4, 6, 6, 5, 7, 5, 7, 7, 6, 8, 3, 5, 4, 5, 6, 4, 4, 5, 6, 5, 7
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) = A004427(A000040(n)). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 27 2010]
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FORMULA
| a(n)=ceil(A007605(n)/A097944(n)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2008
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EXAMPLE
| prime numbers: 2,3,5,7,11,13,17,19,23... so the average digits rounded up are; 2, 3, 5, 7, (1+1)/2=1, (1+3)/2=2, (1+7)/2=4, (1+9)/2=5,ceiling((2+3)/2)=3...
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CROSSREFS
| Cf. A000040, A074461, A073342.
Sequence in context: A117819 A074461 A073342 * A113656 A007652 A060418
Adjacent sequences: A074459 A074460 A074461 * A074463 A074464 A074465
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KEYWORD
| easy,nonn,base
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AUTHOR
| Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 23 2002
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EXTENSIONS
| Changed offset to 1, added Cf. to A073342 and extended. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2008
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