300010

Appears in sequences

• Consider a number k with m decimal digits, the prefix p of length m-1 and the suffix s of length m-1. The sequence lists the numbers k such that sigma(k) = sigma(p)*sigma(s) where sigma(x) is the sum of the divisors of x.at n=35A244313
• Numbers n such that sum of decimal digits of n equals number of prime divisors of n counted with multiplicity and sum of distinct decimal digits of n equals number of distinct primes dividing n.at n=26A280911
• 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=9A291256
• Irregular triangle read by rows: row n lists all of the distinct derivable strings in the MIU formal system that are n characters long.at n=22A369173