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A073816 Mod[2^sigma(n),n]. 1
0, 0, 1, 0, 4, 4, 4, 0, 2, 4, 4, 4, 4, 8, 1, 0, 4, 8, 4, 4, 4, 20, 4, 16, 23, 12, 16, 4, 4, 16, 4, 0, 25, 30, 1, 20, 4, 26, 22, 24, 4, 22, 4, 16, 19, 18, 4, 16, 36, 42, 1, 4, 4, 46, 26, 8, 28, 6, 4, 16, 4, 2, 4, 0, 1, 16, 4, 64, 49, 36, 4, 8, 4, 64, 16, 44, 64, 40, 4, 64, 11, 64, 4, 4, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

n=17: sigma[17]=18, 2^18=262144, Mod[262144,17]=4=a(17).

MATHEMATICA

Table[PowerMod[2, DivisorSigma[1, n], n], {n, 90}] (* Harvey P. Dale, Jun 23 2014 *)

CROSSREFS

Cf. A000203, A015910.

Sequence in context: A241056 A212618 A066602 * A084452 A176101 A052283

Adjacent sequences:  A073813 A073814 A073815 * A073817 A073818 A073819

KEYWORD

nonn

AUTHOR

Labos Elemer, Aug 16 2002

STATUS

approved

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Last modified July 8 07:16 EDT 2020. Contains 335513 sequences. (Running on oeis4.)