

A162310


The count of lessertwinprimes smaller than the nth 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
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

The count of members of A001359 smaller than A007510(n).


LINKS

Table of n, a(n) for n=1..72.


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

Cf. A000040, A141468, A073425.
Sequence in context: A273227 A319500 A022911 * A116962 A273777 A023846
Adjacent sequences: A162307 A162308 A162309 * A162311 A162312 A162313


KEYWORD

nonn


AUTHOR

JuriStepan Gerasimov, Jul 01 2009


EXTENSIONS

Entried checked by R. J. Mathar, Sep 23 2009


STATUS

approved



