1,2
Perfect powers with k = 2.
Table of n, a(n) for n=1..34.
Cf. A111231.
Sequence in context: A099998 A030140 A153158 * A062503 A063577 A087058
Adjacent sequences: A111242 A111243 A111244 * A111246 A111247 A111248
nonn
Giovanni Teofilatto, Oct 31 2005
approved