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A162310
The count of lesser-twin-primes smaller than the n-th isolated prime.
0
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
OFFSET
1,2
COMMENTS
The count of members of A001359 smaller than A007510(n).
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Entried checked by R. J. Mathar, Sep 23 2009
STATUS
approved