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A294930 Characteristic function for A091191, primitive abundant numbers: abundant numbers (A005101) having no abundant proper divisor. 6
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..67004

Index entries for characteristic functions

FORMULA

a(n) = A294937(n) * [0==A294929(n)].

a(n) = 1 iff A080224(n) = 1.

PROG

(PARI)

A294937(n) = (sigma(n)>(2*n));

A294929(n) = sumdiv(n, d, (d<n)*A294937(d));

A294930(n) = (A294937(n)*(0==A294929(n)));

CROSSREFS

Cf. A005101, A080224, A091191, A187795, A294890, A294929, A294937.

Sequence in context: A277160 A277163 A297041 * A294937 A277156 A297040

Adjacent sequences:  A294927 A294928 A294929 * A294931 A294932 A294933

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 14 2017

STATUS

approved

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Last modified January 23 01:55 EST 2018. Contains 298093 sequences.