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A353616
a(n) is the denominator of the median abundancy index of the first 2^n + 1 positive integers.
2
3, 3, 9, 2, 21, 29, 41, 59, 73, 107, 139, 157, 4941, 7707, 157, 1929, 1973, 7643, 147749, 313733, 1774479, 1015973, 1615943, 6646647, 3280781, 5670497, 31673271, 21228137
OFFSET
1,1
COMMENTS
See A353615 for more details.
MATHEMATICA
With[{m = 20}, t = Table[DivisorSigma[-1, n], {n, 1, 2^m + 1}]; Denominator @ Table[Median[t[[1 ;; 2^n + 1]]], {n, 1, m}]]
CROSSREFS
Cf. A000203, A017665, A017666, A353615 (numerators), A353617.
Sequence in context: A093096 A097670 A144809 * A225074 A127795 A074724
KEYWORD
nonn,frac,more
AUTHOR
Amiram Eldar, Apr 30 2022
STATUS
approved