102428

Appears in sequences

• Least k such that decimal representation of k*n contains only digits 0 and 4.at n=42A096683
• p-INVERT of (1,1,0,0,0,0,...), where p(S) = 1 - 4 S + 2 S^2.at n=7A291417
• a(n) = Sum_{i|n, j|n, k|n} i*j*k/gcd(i,j,k).at n=44A344133