A116988 Sum of digits of (10^n)!.

1, 27, 648, 10539, 149346, 1938780, 23903442, 284222502, 3292100235, 37420852599

Offset: 0

Author

Zak Seidov, Apr 02 2006

Keywords

• hard
• more
• nonn
• base

Comments

Cf. A004152 Sum of digits of factorial numbers, A113364 1,27,648,16245,... with first three terms coinciding with this SEQ.

Examples

			a(1)=27 because 10!=3628800 and 3+6+2+8+8+0+0=27.
		

Crossrefs

Cf. A004152, A113364.

Programs

Mathematica

Do[Print[Total[IntegerDigits[(10^n)! ]]], {n, 0, 7}]

Python

from math import factorial
def A116988(n):
    return sum(int(d) for d in str(factorial(10**n))) # Chai Wah Wu, May 21 2018

Extensions

One more term from Ryan Propper, Jun 27 2007

a(9) from Chai Wah Wu, May 21 2018