1,6
a(12)=3 because 9=3^2 is the nearest power to 12 (12-9=3).
Sequence in context: A025880 A058755 A128519 * A108063 A164846 A026729
Adjacent sequences: A061667 A061668 A061669 * A061671 A061672 A061673
nonn
Michel ten Voorde (seqfan(AT)tenvoorde.org) Jun 16 2001