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Sum of digits of (10^n)!.
2

%I #8 May 21 2018 18:26:39

%S 1,27,648,10539,149346,1938780,23903442,284222502,3292100235,

%T 37420852599

%N Sum of digits of (10^n)!.

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

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

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

%o (Python)

%o from math import factorial

%o def A116988(n):

%o return sum(int(d) for d in str(factorial(10**n))) # _Chai Wah Wu_, May 21 2018

%Y Cf. A004152, A113364.

%K hard,more,nonn,base

%O 0,2

%A _Zak Seidov_, Apr 02 2006

%E One more term from _Ryan Propper_, Jun 27 2007

%E a(9) from _Chai Wah Wu_, May 21 2018