40960

Appears in sequences

• a(n) = 10*4^n.at n=6A002066
• Berstel sequence: a(n+1) = 2*a(n) - 4*a(n-1) + 4*a(n-2).at n=21A007420
• Number of noninvertible 2 X 2 matrices over Z/nZ (determinant is a divisor of 0).at n=14A020479
• a(n) = 5 * 2^n.at n=13A020714
• Numbers of form 2^i*10^j, with i, j >= 0.at n=46A025612
• Numbers of form 4^i*10^j, with i, j >= 0.at n=24A025621
• Numbers of form 8^i*10^j, with i, j >= 0.at n=16A025634
• Expansion of (1 + 2x + 6x^2 + x^3)/(1 - 2x^2).at n=29A029745
• Numbers of the form 2^k times 1, 3 or 5.at n=43A029747
• Numbers of the form 2^k times 1, 5 or 7.at n=42A029749
• Numbers whose prime factors are 2 and 5.at n=40A033846
• First differences of A045891.at n=15A034007
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*8^j.at n=19A038214
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*8^j.at n=17A038238
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*2^j.at n=16A038280
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*4^j.at n=18A038282
• Numbers n such that n+cototient(n) is a power of 2.at n=25A053159
• Nonprimes n such that n+cototient(n) is a power of 2.at n=20A053162
• Numbers of the form 2^i*5^j where i+j is even.at n=31A054901
• a(n) = (9*2^n + (-2)^n)/4 for n>0.at n=13A056486