OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..2500
MATHEMATICA
PrimePi /@ Select[ FoldList[Plus, 0, Prime@ Range@450], PrimeQ@# &] (* Robert G. Wilson v Sep 28 2006 *)
PrimePi/@Select[Accumulate[Prime[Range[500]]], PrimeQ] (* Harvey P. Dale, Jun 05 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Renaud Lifchitz (100637.64(AT)CompuServe.COM), David W. Wilson
STATUS
approved