40608

Appears in sequences

• Composite numbers k such that phi(k) divides sigma(k) - 2*k.at n=25A068412
• Primitive elements of A096490.at n=23A118671
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives y numbers.at n=6A125491
• An unrestricted partition statistic: sum of A179864 over row n.at n=25A179862
• Numbers with prime factorization pq^3r^5.at n=21A190011
• Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.at n=1A221936
• T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.at n=22A221937
• Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.at n=5A221938
• Numbers that belong to at least one amicable tuple.at n=33A255215
• Number of non-normal semi-magic squares with sum of entries equal to n.at n=8A321719
• Numbers k such that sigma(k) = 2*k + 3*phi(k).at n=6A392691