a(n) = sum{n/2<=k<=n, GCD(k,n)=1} k.
1, 1, 2, 3, 7, 5, 15, 12, 20, 16, 40, 18, 57, 33, 46, 48, 100, 41, 126, 60, 96, 85, 187, 72
2 seqfan posts
Sun Jan 4 19:22:23 CET 2009 [seqfan] Re: Question related to sequence A083188
Sun Jan 4 16:33:02 CET 2009 [seqfan] Question related to sequence A083188
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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