|
| |
|
|
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;
text;
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
|
Table of n, a(n) for n=0..10.
Cino Hilliard, Approximating the n-th lower twin prime (broken link)
|
|
|
FORMULA
|
a(n) = A001359(10^n). - 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 10th lower twin prime.
|
|
|
CROSSREFS
|
Cf. A001097, A147797.
Sequence in context: A023325 A094200 A003705 * A261997 A061308 A302060
Adjacent sequences: A146211 A146212 A146213 * A146215 A146216 A146217
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
Cino Hilliard, Oct 28 2008
|
|
|
EXTENSIONS
|
a(0) from Zak Seidov, Oct 29 2008
Edited and cross-references added by M. F. Hasler, Dec 06 2008
|
|
|
STATUS
|
approved
|
| |
|
|
