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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A122691 a(n)=least prime factor of (9*10^m-11)/7, m=6n-4. 0
127, 401, 19, 53, 151, 7, 139, 127, 19, 78721, 3458771, 19, 7, 38954263, 19, 79, 53, 19, 157, 7, 19, 127, 18191, 19, 12119, 421, 7, 127, 401, 19, 53, 151, 7, 139, 127, 19, 78721, 3458771, 19, 7, 38954263, 19, 79, 53, 19, 157, 7, 19, 127, 18191, 19, 12119, 421, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

n=2, m=8, (9*10^m-11)/7 = 128571427=401*320627 hence a(2)=401

CROSSREFS

Cf. A100275, A122862.

Sequence in context: A095312 A143034 A159521 * A082251 A142384 A298237

Adjacent sequences:  A122688 A122689 A122690 * A122692 A122693 A122694

KEYWORD

nonn

AUTHOR

Zak Seidov, Sep 22 2006

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 October 13 23:52 EDT 2019. Contains 327983 sequences. (Running on oeis4.)