Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #6 May 14 2016 15:35:28
%S 1,2,3,7,13,13,17,29,31,61,61,61,61,61,61,61,61,109,109,109,109,109,
%T 109,109,109,128,128,128,128,128,128,128,128,256,256,256,256,256,256,
%U 256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,512,512,512,512,512
%N Discriminator of Sylvester's sequence A000058.
%C The discriminator of a sequence is the least positive integer k such that the first n terms of the sequence are pairwise incongruent, modulo k.
%Y Cf. A000058.
%K nonn
%O 1,2
%A _Jeffrey Shallit_, May 14 2016