OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=3+5+7-2=13; a(2)=7+11+13-2=29; a(3)=13+17+19-2=47.
MATHEMATICA
Select[Table[Sum[Prime[k], {k, n , n + 2}] - 2, {n, 1, 100}], PrimeQ] (* G. C. Greubel, Apr 24 2016 *)
Select[Total/@Partition[Prime[Range[300]], 3, 1]-2, PrimeQ] (* Harvey P. Dale, Dec 31 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 05 2009
EXTENSIONS
1997 removed and 2267 added by R. J. Mathar, Oct 08 2009
STATUS
approved