References to A081238

#{(i,j): mu(i)*mu(j) = -1, 1<=i<=n, 1<=j<=n}, where mu=A008683 (Moebius function).
0, 2, 4, 4, 6, 12, 16, 16, 16, 24, 30, 30, 36, 48, 60, 60, 70, 70, 80, 80, 96, 112, 126


1 seqfan posts

Thu Mar 18 19:42:47 CET 2010    [seqfan] Re: A078198 erroneous?

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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