The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 21 04:06 EDT 2024. Contains 372720 sequences. (Running on oeis4.)