1,3
Table of n, a(n) for n=1..20.
G. Nordh, Perfect Skolem sequences
Cf. A004075, A060963, A099152.
Sequence in context: A032637 A034576 A125672 * A259400 A320087 A014335
Adjacent sequences: A107680 A107681 A107682 * A107684 A107685 A107686
nonn
Ralf Stephan, Jun 10 2005
approved