login
A122691
a(n) is the least prime factor of (9 * 10^(6*n-4) - 11) / 7.
1
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, 107434435760557861791327959267859939351202240879711219728393537522815146155523913, 79, 19, 23196834569628410341642097660316821
OFFSET
1,1
LINKS
EXAMPLE
n=2, (9*10^8-11)/7 = 128571427 = 401 * 320627 hence a(2)=401.
CROSSREFS
Sequence in context: A095312 A143034 A159521 * A082251 A142384 A298237
KEYWORD
nonn
AUTHOR
Zak Seidov, Sep 22 2006
EXTENSIONS
a(28) onward corrected by Sean A. Irvine, May 25 2024
STATUS
approved