OFFSET
1,1
EXAMPLE
Since 13^2+1 = 170 = 2*5*17, the three terms 2, 5, 17 appear in the sequence.
PROG
(PARI) row(n)={m=n^2+1; while(m!=1, p=factor(m)[1, 1]; print(p); m=m/p)}
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Michael B. Porter, Oct 13 2009
STATUS
approved