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Search: id:A074325
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| A074325 |
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Difference between (1+2^n)-th and (2^n)-th primes. Also number of terms in blocks of A073798. |
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+0
5
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| 1, 2, 4, 4, 6, 6, 2, 8, 2, 2, 6, 18, 18, 30, 8, 24, 6, 2, 18, 4, 26, 30, 34, 2, 10, 30, 10, 2, 30, 6, 70, 4, 12, 22, 6, 24, 26, 10, 88, 2, 50, 18, 6
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=A051439(n)-A033844(n)
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EXAMPLE
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n=39: 2^39=549755813888, prime[549755813889]=16149760533343, prime[549755813888]=16149760533341, difference=2,just twin primes.
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MATHEMATICA
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Table[Prime[1+2^w]-Prime[2^w], {w, 1, 39}]
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CROSSREFS
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Cf. A051439, A033844, A073798, A000079.
Sequence in context: A152782 A057696 A057697 this_sequence A058249 A058043 A162550
Adjacent sequences: A074322 A074323 A074324 this_sequence A074326 A074327 A074328
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KEYWORD
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nonn,hard
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 21 2002
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EXTENSIONS
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More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Jun 13 2003
a(42) from Max Alekseyev (maxale(AT)gmail.com), May 08 2009
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