444441

Appears in sequences

• Smallest semiprime containing exactly n 4's.at n=4A104690
• Near-repdigit semiprimes with 4 as repeated digit.at n=11A105985
• a(n) = A131766(n) / 18.at n=30A131871
• a(n) = 1 + 111110*n.at n=4A135403
• a(n) = (4*10^n - 31)/9.at n=5A173768