OFFSET
1,1
COMMENTS
Or, for i <> j, (a(i) + a(j))/2 are primes.
From a(5)=139 onward, all terms are 19 (mod 20).
Is sequence finite?
Is this a duplicate of A115760? - R. J. Mathar, Jul 22 2010
CROSSREFS
KEYWORD
dead
AUTHOR
Zak Seidov, Jun 12 2010
EXTENSIONS
More terms from Don Reble, Aug 17 2021
STATUS
approved