51809

Appears in sequences

• Numbers m such that m and m+2 are both brilliant numbers, where brilliant numbers are semiprimes whose prime factors have an equal number of decimal digits, or whose prime factors are equal.at n=31A083284
• Composite numbers n such that every divisor of n greater than one contains the digit 0.at n=14A243819
• 4-step Fibonacci sequence starting with 1,1,0,0.at n=20A251703