OFFSET
1,1
EXAMPLE
If n=10, then (p(10)-2*10)/3=(29-20)/3=3=a(1).
If n=11, then (p(11)-2*11)/3=(31-22)/3=3=a(2).
If n=13, then (p(13)-2*13)/3=(41-26)/3=5=a(3).
If n=14, then (p(14)-2*14)/3=(43-28)/3=5=a(4).
If n=16, then (p(16)-2*16)/3=(53-32)/3=7=a(5).
If n=28, then (p(28)-2*28)/3=(107-56)/3=17=a(6), etc.
MATHEMATICA
Select[Table[(Prime[n]-2n)/3, {n, 400}], PrimeQ] (* Harvey P. Dale, May 05 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 07 2008
EXTENSIONS
Corrected (5 duplicated, 29 inserted, double-43 inserted etc.) by R. J. Mathar, Apr 18 2010
STATUS
approved