546750

Appears in sequences

• LB numbers: positive integers of the form m = a*10^k+b (with a > 0 and b < 10^k) satisfying two properties: 1) the set of prime factors of m is the union of the sets of prime factors of a and b; and 2) A001222(m) = A001222(a) + A001222(b).at n=25A267856
• Primordial LB numbers: LB numbers (A267856) that are not of the form 10*n where n is also an LB number.at n=10A268269