OFFSET
1,1
COMMENTS
Primes of the form 100*k+21 with no other prime of the form 100*k+j for j=1 to 99 with the same k.
Thanks for the assistance and research of John Moyer. There is likely an infinite number of such primes.
EXAMPLE
a(1)=155921 is prime and it is the only prime between 155900 and 156000.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Ki Punches, Dec 14 2009
EXTENSIONS
Definition detailed and more terms appended by R. J. Mathar, Oct 09 2010
STATUS
approved