A132386 Sum of all n-digit superabundant numbers.

13, 180, 2460, 10500, 133560, 2827440, 27387360, 203963760, 2254412160, 19260521280, 233956522800, 2570029862400, 33892268810400, 312098001415200, 2636529385089600, 17906040558806400, 307146357004687200, 1832625489772677600, 29247206795963956800, 387955596028816015200

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