login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A084955 Initial prime of a prime chain of length n under the iteration x->2x+5. 7
2, 3, 7, 13, 13, 13, 541, 4594309, 64649503, 7577449963, 2005324830163, 39676048812109, 272235769110157, 494535766350049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

a(3)=7 since 7, 2*7+5=19 and 2*19+5=43 are primes.

CROSSREFS

Cf. A084954.

Sequence in context: A225093 A278007 A081256 * A273056 A026472 A286176

Adjacent sequences:  A084952 A084953 A084954 * A084956 A084957 A084958

KEYWORD

nonn,more

AUTHOR

W. Edwin Clark, Jun 14 2003

EXTENSIONS

More terms from Don Reble, Nov 07 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 20 22:20 EDT 2019. Contains 325189 sequences. (Running on oeis4.)