OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
floor(10/4)=2, floor(15/4)=3, floor(21/4)=5, ...
MATHEMATICA
f[n_]:=n*(n+1)/2; lst={}; Do[If[PrimeQ[p=Floor[f[n]/4]], AppendTo[lst, p]], {n, 7!}]; lst
Select[Floor[Accumulate[Range[600]]/4], PrimeQ] (* Harvey P. Dale, Nov 09 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Dec 12 2009
STATUS
approved