A280782 - OEIS

%I #19 Mar 12 2017 16:48:08

%S 1,2,6,15,42,99,262,633,1592,3897,9697,23767,58804,144541

%N Number of irreducible matrices X of all sizes with nonnegative integral entries satisfying X^2 = nX.

%H Jakob Zimmermann, <a href="http://arxiv.org/abs/1701.03699">Counting quasi-idempotent irreducible integral matrices</a>, arXiv:1701.03699 [math.CO], 2017.

%Y Cf. A280783.

%K nonn,more

%O 1,2

%A _N. J. A. Sloane_, Jan 20 2017

%E Definition corrected by _N. J. A. Sloane_, Jan 23 2017 at the suggestion of _Jakob Zimmermann_

%E a(14) from _Jakob Zimmermann_, Jan 23 2017