A122691 a(n)=least prime factor of (9*10^m-11)/7, m=6n-4.

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

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