A127390 Sum of all n-digit highly composite numbers.

13, 180, 2460, 18060, 332640, 3548160, 37837800, 311351040, 3455131680, 32639967360, 479785466160, 3379449593520, 44734582292400, 527257688958000, 3493634344200000, 31840983413038800, 408373247583100800

Offset

1,1

Links

Robert G. Wilson v, Table of n, a(n) for n = 1..76

Graeme McRae, Highly Composite Numbers

S. Ramanujan, Highly composite numbers, Proceedings of the London Mathematical Society, 2, XIV, 1915, 347 - 409.

Example

If n=1 then the sum of the highly composite numbers 1+2+4+6 = 13 which is the first term in the sequence.
If n=2 then the sum of the highly composite numbers 12+24+36+48+60 = 180 which is the second term in the sequence.

Crossrefs

Cf. A002182.

Sequence in context: A295119 A196956 A132386 * A142646 A201607 A083576

Adjacent sequences: A127387 A127388 A127389 * A127391 A127392 A127393

Keyword

nonn,base

Author

Parthasarathy Nambi, Mar 30 2007

Extensions

More terms from Robert G. Wilson v, Apr 08 2007

Status

approved