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Search: id:A129856
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| A129856 |
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Primes that are one less than the difference between consecutive primes. |
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+0
2
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| 3, 3, 3, 5, 5, 3, 3, 5, 5, 5, 3, 5, 3, 5, 7, 3, 3, 3, 13, 3, 5, 5, 5, 3, 5, 5, 3, 11, 11, 3, 3, 5, 5, 5, 5, 5, 3, 13, 3, 3, 13, 5, 3, 5, 7, 5, 5, 3, 5, 7, 3, 7, 5, 3, 5, 7, 3, 3, 11, 7, 3, 7, 3, 5, 11, 17, 5, 5, 5, 5, 5, 5, 5, 5, 3, 11, 3, 5, 5, 11, 3, 5, 7, 7, 7, 5, 5, 3, 7, 5, 3, 7, 3, 13, 11, 3, 13, 3, 3
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Cino Hilliard, Frequency of primes.
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EXAMPLE
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The first 4 consecutive prime pairs are (2,3),(3,5),(5,7),(7,11). The differences - 1 are the primes 0,1,1,3. The first three of these are not prime so 3 is the first entry in the table.
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PROGRAM
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(PARI) diffp1p2(n) = { local(p1, p2, y); for(x=1, n, p1=prime(x); p2=prime(x+1); y=(p2-p1)- 1; if(isprime(y), print1(y", ") ) ) }
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CROSSREFS
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Sequence in context: A076566 A083574 A108025 this_sequence A136800 A126661 A162226
Adjacent sequences: A129853 A129854 A129855 this_sequence A129857 A129858 A129859
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), May 23 2007
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