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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
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The count of members of A001359 smaller than A007510(n).
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EXAMPLE
| 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
| Cf. A000040, A141468, A073425.
Sequence in context: A058979 A046343 A022911 * A116962 A023846 A046345
Adjacent sequences: A162307 A162308 A162309 * A162311 A162312 A162313
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KEYWORD
| nonn
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 01 2009
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EXTENSIONS
| Entried checked by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2009
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