OFFSET
1,1
COMMENTS
This is a special case of prime chains generated by f(x) = cx + d.
LINKS
D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186.
EXAMPLE
a(3)=7 since 7, 2*7+5=19 and 2*19+5=43 are primes.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
W. Edwin Clark, Jun 14 2003
EXTENSIONS
More terms from Don Reble, Nov 07 2007
STATUS
approved