81782

Appears in sequences

• Exponent of least power of 2 having exactly n consecutive 5's in its decimal representation.at n=9A131539
• a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n+2)*a(n-2) + 1.at n=11A213720
• a(n) = Sum_{j=1..n} A003718(j-1)*prime(j).at n=47A342604