|
| |
|
|
A146214
|
|
a(n) = 10^n-th lower twin prime.
|
|
3
| |
|
|
3, 107, 3821, 79559, 1260989, 18409199, 252427601, 3285916169, 41375648687, 507575862527, 6100479510551
(list; graph; refs; listen; history; internal format)
|
|
|
|
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 n-th prime number and the n-th twin prime number. For example the 10^10-th 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
| Cino Hilliard, Approximating the n-th lower twin prime
|
|
|
FORMULA
| a(n) = A001359(10^n) [From M. F. Hasler, Dec 06 2008]
|
|
|
EXAMPLE
| The first 10 lower twin primes are 3,5,11,17,29,41,59,71,101,107. So 107 is the 10-th lower twin prime.
|
|
|
CROSSREFS
| Cf. A001097, A147797.
Sequence in context: A023325 A094200 A003705 * A061308 A112879 A172271
Adjacent sequences: A146211 A146212 A146213 * A146215 A146216 A146217
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Cino Hilliard (hillcino368(AT)hotmail.com), Oct 28 2008
|
|
|
EXTENSIONS
| a(0) from Zak Seidov, Oct 29 2008
Edited and added cross-references. - M. F. Hasler (www.univ-ag.fr/~mhasler), Dec 06 2008
|
| |
|
|
