|
Search: id:A084955
|
|
|
| A084955 |
|
Initial prime of a prime chain of length n under the iteration x->2x+5. |
|
+0
8
|
|
| 2, 3, 7, 13, 13, 13, 541, 4594309, 64649503, 7577449963, 2005324830163, 39676048812109, 272235769110157, 494535766350049
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
This is a special case of prime chains generated by f(x) = cx + d.
|
|
REFERENCES
|
D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186.
|
|
EXAMPLE
|
a(3)=7 since 7, 2*7+5=19 and 2*19+5=43 are primes.
|
|
CROSSREFS
|
Cf. A084954.
Sequence in context: A084423 A068134 A081256 this_sequence A026472 A101739 A045327
Adjacent sequences: A084952 A084953 A084954 this_sequence A084956 A084957 A084958
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
|
|
EXTENSIONS
|
More terms from Don Reble (djr(AT)nk.ca), Nov 07 2007
|
|
|
Search completed in 0.002 seconds
|
