31949

Appears in sequences

• Composite and every divisor (except 1) contains the digit 4.at n=23A062670
• n*10^3-1, n*10^3-3, n*10^3-7 and n*10^3-9 are all prime.at n=16A064977
• Number of primes less than 10^n having at least one digit 5.at n=5A091706
• Expansion of (1-11*x+34*x^2-21*x^3+2*x^4)/((1-x)*(1-2*x)*(1-4*x)*(1-5*x)*(1-6*x)).at n=6A246987
• a(n) = 2*(n-1)*a(n-1) - a(n-2) + 2*(n-2)*a(n-3) with a(0)=a(1)=a(2)=1.at n=7A269820
• Number of primitive (period n) bracelet structures using an infinite alphabet.at n=10A276548
• Numbers b > 1 such that the smallest four primes, i.e., 2, 3, 5 and 7 are base-b Wieferich primes.at n=34A339533
• a(n) is the number of triangular partitions whose Young diagram fits inside a square of side n.at n=32A368638