OFFSET
1,3
COMMENTS
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "20081".
a(22) > 10^5. - Robert Price, Jan 19 2017
LINKS
EXAMPLE
n = 3 is a term because 2*10^3 + 81 = 2*1000 + 81 = 2000 + 81 = 2081 and 2081 is prime.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005
EXTENSIONS
a(15)-a(18) from Kamada link by Ray Chandler, Dec 23 2010
a(1)-a(2) prepended by Robert Price, Jan 19 2017
a(19)-a(21) from Robert Price, Jan 19 2017
STATUS
approved