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Search: id:A162310
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| A162310 |
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The count of lesser-twin-primes smaller than the n-th isolated prime. |
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+0
1
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| 0, 4, 5, 6, 6, 7, 8, 8, 8, 8, 10, 10, 10, 12, 12, 12, 12, 15, 15, 16, 17, 17, 17, 18, 19, 19, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 27, 27, 28, 29, 29, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The count of members of A001359 smaller than A007510(n).
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EXAMPLE
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a(1)=0 because there is no twin prime smaller than 2.
a(2)= 4 counts the numbers 3, 5, 11, and 17 all smaller than 23.
a(3) = 5 counts the numbers 3, 5, 11, 17, and 29 all smaller than 37.
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CROSSREFS
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Cf. A000040, A141468, A073425.
Sequence in context: A058979 A046343 A022911 this_sequence A116962 A023846 A046345
Adjacent sequences: A162307 A162308 A162309 this_sequence A162311 A162312 A162313
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 01 2009
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EXTENSIONS
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Entried checked by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2009
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