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Search: id:A074463
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| A074463 |
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Average digit (rounded up) in the decimal expansion of a prime number p, where 2^p-1 is a Mersenne prime. |
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+0
2
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| 2, 3, 5, 7, 2, 4, 5, 2, 4, 9, 3, 4, 3, 5, 5, 2, 4, 4, 4, 4
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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prime numbers for Mersenne: 2,3,5,7,13,17,19,31,61 so the average digits rounded up are; 2, 3, 5, 7, (1+3)/2=2, (1+7)/2=4, (1+9)/2=5, (3+1)/2=2,ceiling((6+1)/2)=4...
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CROSSREFS
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Cf. A000043, A074464..
Sequence in context: A139751 A076779 A074464 this_sequence A038194 A111309 A007605
Adjacent sequences: A074460 A074461 A074462 this_sequence A074464 A074465 A074466
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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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