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A279635 Denominator of (0 followed by A005126(n)= 2, 4, 7, ...)/2^n, a sequence corresponding to A271573. 1
1, 1, 1, 8, 4, 32, 32, 128, 32, 512, 512, 2048, 1024, 8192, 8192, 32768, 4096, 131072, 131072, 524288, 262144, 2097152, 2097152, 8388608, 2097152, 33554432, 33554432, 134217728, 67108864, 536870912, 536870912, 2147483648, 134217728, 8589934592, 8589934592, 34359738368, 17179869184, 137438953472, 137438953472, 549755813888, 137438953472 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..40.

FORMULA

a(n) = 2^(n-valuation(2^(n-1)+n,2)), with a(0) = 1.

MATHEMATICA

a[0] = 1; a[n_] := Denominator[(2^(n-1)+n)/2^n]; Table[a[n], {n, 0, 40}]

(* or *)

a[0] = 1; a[n_] := 2^(n-IntegerExponent[2^(n-1)+n, 2]); Table[a[n], {n, 0, 40}]

CROSSREFS

Cf. A005126, A075101, A271573.

Sequence in context: A213773 A213178 A082682 * A213505 A270232 A270716

Adjacent sequences:  A279632 A279633 A279634 * A279636 A279637 A279638

KEYWORD

nonn,frac

AUTHOR

Jean-François Alcover and Paul Curtz, Dec 16 2016

STATUS

approved

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Last modified September 22 15:16 EDT 2018. Contains 315270 sequences. (Running on oeis4.)