1,2
a(n) = A000290(A020639(n)).
Table of n, a(n) for n=1..76.
Eric Weisstein's World of Mathematics, Least Prime Factor
Eric Weisstein's World of Mathematics, Square Number
Cf. A088378, A088379.
Cf. A068319.
Cf. A247180.
Sequence in context: A204996 A061369 A291645 * A066048 A103164 A210966
Adjacent sequences: A088374 A088375 A088376 * A088378 A088379 A088380
nonn
Reinhard Zumkeller, Sep 28 2003
approved