|
| |
|
|
A084957
|
|
Initial prime of a prime chain of length n under the iteration x->4x+3.
|
|
6
| |
|
|
2, 2, 2, 2, 1447, 9769, 17231, 17231, 32611, 18527009, 161205841, 3123824801
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| This is a special case of prime chains generated by f(x) = cx + d.
a(13) > 9886408333. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008]
|
|
|
REFERENCES
| D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186.
|
|
|
EXAMPLE
| a(3)=2 since 2, f(2) =11 and f(11) = 47 are primes when f(x) = 4x+3
|
|
|
CROSSREFS
| Cf. A057330, A057331, A083388, A084954, A084955, A084956, A084958, A084959, A084960, A084961.
Sequence in context: A154288 A084954 A049300 * A035307 A004481 A004489
Adjacent sequences: A084954 A084955 A084956 * A084958 A084959 A084960
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
|
|
|
EXTENSIONS
| a(11)-a(12) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008
|
| |
|
|
