0,4

Pierre CAMI, Table of n, a(n) for n = 0..999

for n=0 1*(10^0)+1=2 prime so a(0)=1

for n=1 1*(10^1)+1=11 prime so a(1)=1

for n=2 1*(10^2)+1=101 prime so a(2)=1

for n=3 2*(10^3)-1=1999 prime so a(3)=2

Sequence in context: A100955 A049413 A300691 * A134486 A088006 A078311

Adjacent sequences: A102704 A102705 A102706 * A102708 A102709 A102710

nonn

Pierre CAMI, Feb 05 2005

Initial term of b-file corrected by N. J. A. Sloane, Aug 31 2009

approved