A060666 - OEIS

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A060666

Sigma(x) = n has exactly ten solutions.

504, 864, 960, 1152, 1260, 2400, 3276, 3888, 4992, 6696, 7020, 7644, 8892, 9672, 9984, 11172, 11200, 11376, 11616, 11856, 12936, 13728, 13888, 14136, 14280, 15480, 15876, 15984, 17808, 19488, 21336, 22608, 23688, 24738, 24840, 25080

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..36.

EXAMPLE

504 = sigma(204) = sigma(220) = sigma(224) = sigma(246) = sigma(284) = sigma(286) = sigma(334) = sigma(415) = sigma(451) = sigma(504).

MATHEMATICA

a = Table[ 0, {30000} ]; Do[ s = DivisorSigma[ 1, n ]; If[ s < 30001, a[ [ s ] ]++ ], {n, 1, 30000} ]; Select[ Range[ 30000 ], a[ [ # ] ] == 10 & ]

CROSSREFS

Cf. A007370, A007371, A007372.

Sequence in context: A045212 A262873 A228164 * A335654 A226265 A277114

Adjacent sequences: A060663 A060664 A060665 * A060667 A060668 A060669

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Apr 18 2001

STATUS

approved