45712

Appears in sequences

• Number of solutions to c(1)*prime(3)+...+c(n)*prime(n+2) = 1, where c(i) = +-1 for i>1, c(1) = 1.at n=24A022901
• Replace n with the concatenation of its anti-divisors.at n=15A130846
• Number x = concat(MSD(x),b) such that MSD(x)*b = phi(x), where MSD(x) is the Most Significant Digit of x and phi(x) is the Euler totient function of x.at n=31A286130
• Number of nX5 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.at n=12A301659
• The number of simple polygons having all points of a 3 X n grid as vertices.at n=6A331235