A353616 a(n) is the denominator of the median abundancy index of the first 2^n + 1 positive integers.

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.

Links

Table of n, a(n) for n=1..28.

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

Adjacent sequences: A353613 A353614 A353615 * A353617 A353618 A353619

Keyword

nonn,frac,more

Author

Amiram Eldar, Apr 30 2022

Status

approved