Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
1,1
Table of n, a(n) for n=1..12.
a(4)=5 because we can write
..t...t..
..w...h..
f.o.u.r..
......e..
..o.n.e..
and no smaller square suffices.
Sequence in context: A075260 A054847 A067782 * A021302 A004649 A002374
Adjacent sequences: A035296 A035297 A035298 * A035300 A035301 A035302
more,nonn,word
Mike Keith (domnei(AT)aol.com)
approved