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A132386 Sum of all n-digit superabundant numbers. 0
13, 180, 2460, 10500, 133560, 2827440, 27387360, 203963760, 2254412160, 19260521280, 233956522800, 2570029862400, 33892268810400, 312098001415200, 2636529385089600, 17906040558806400, 307146357004687200, 1832625489772677600, 29247206795963956800, 387955596028816015200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, Superabundant Number.

EXAMPLE

Sum of all 1-digit superabundant numbers is 1 + 2 + 4 + 6 = 13.

Sum of all 2-digit superabundant numbers is 12 + 24 + 36 + 48 + 60 = 180.

Sum of all 3-digit superabundant numbers is 120 + 180 + 240 + 360 + 720 + 840 = 2460.

CROSSREFS

Cf. A004394.

Sequence in context: A197198 A295119 A196956 * A127390 A142646 A201607

Adjacent sequences:  A132383 A132384 A132385 * A132387 A132388 A132389

KEYWORD

nonn,base,less

AUTHOR

Parthasarathy Nambi, Nov 07 2007

EXTENSIONS

More terms from Amiram Eldar, Nov 30 2019

STATUS

approved

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Last modified October 26 14:28 EDT 2021. Contains 348267 sequences. (Running on oeis4.)