OFFSET
1,1
LINKS
Chris Caldwell The First 10,000 Primes.
EXAMPLE
The first term is 9 since it is the sum of 2 and 7, the smallest and largest of 1-digit primes.
PROG
(Sage) def A104224(n): return next_prime(10**(n-1))+previous_prime(10**n) # [D. S. McNeil, Feb 03 2011]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Apr 01 2005
STATUS
approved