40000010

Appears in sequences

• a(n)! has exactly 10^n trailing zeros (a(n) = -1 if no such number exists).at n=7A173292
• a(n) is the smallest number whose factorial has 10^n trailing zeros.at n=7A173558
• Numbers n such that Sum_{k>=1} digits(k)/k = 1 where digits() are the digits of n in base 10, the least significant digit having index 1.at n=18A291256