a(1) = 0; for n>1, a(n) = 1 if n is a power of 2, otherwise a(n) = 2.
0, 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2
2 seqfan posts
Wed Nov 30 19:20:06 CET 2011 [seqfan] Re: A puzzle from Emissary