1,1

Table of n, a(n) for n=1..42.

a(2)=7 since if m=2, then there are two solutions (7-5=2), (5-3=2).

Cf. A001223.

Sequence in context: A231432 A271981 A103521 * A023237 A106061 A155703

Adjacent sequences: A103963 A103964 A103965 * A103967 A103968 A103969

easy,nonn

Naohiro Nomoto, Mar 30 2005

approved