

A146214


a(n) = (10^n)th lower twin prime.


3



3, 107, 3821, 79559, 1260989, 18409199, 252427601, 3285916169, 41375648687, 507575862527, 6100479510551
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OFFSET

0,1


COMMENTS

The Gcc with Gmp program is at the bottom of the link. The link also has a PARI bisection algorithm which gives a very good approximation for the nth prime number and the nth twin prime number. For example the 10^10th lower twin prime approximation is 6100475249386, this has a relative error of 0.000000698... from the actual a(10) above.
The (10^n)th upper twin prime is given as a(n)+2 = (5,109,3823,79561, 1260991,18409201,252427603,...).  M. F. Hasler, Dec 06 2008


LINKS



FORMULA



EXAMPLE

For n=1, the first 10 lower twin primes (A001359) are: 3,5,11,17,29,41,59,71,101,107. So a(1) = 107 is the 10th lower twin prime.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS

Edited and crossreferences added by M. F. Hasler, Dec 06 2008


STATUS

approved



