OFFSET
1,1
COMMENTS
The two primes p and p+18 are not necessarily adjacent.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Flatten[Select[{#, # + 18} &/@Prime[Range[1000]], PrimeQ[Last[#]]&]] (* Vincenzo Librandi, Nov 01 2012 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Vincenzo Librandi, Feb 08 2009
STATUS
approved