738720

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=37A000252
• Theta series of extremal 3-modular even lattice in dimension 32.at n=4A034626
• Smallest triangular number having n^2 as divisor.at n=35A080983
• Rolling icosahedron footprints: number of n X 4 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, vertical or antidiagonal neighbor moves along an icosahedral edge.at n=5A223182
• Rolling icosahedron footprints: number of nX6 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, vertical or antidiagonal neighbor moves along an icosahedral edge.at n=3A223184
• T(n,k) = Rolling icosahedron footprints: number of n X k 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, vertical or antidiagonal neighbor moves along an icosahedral edge.at n=39A223186
• Triangular numbers k such that phi(k) is a square number, where phi(k) is the Euler totient function (A000010).at n=22A287473
• Positions of records in A344590.at n=15A344588
• a(n) = A000203(A344422(n)).at n=12A345260
• a(n) is the smallest hexagonal number for which the symmetric representation of sigma(n) has width 2*n, n >= 0, at the diagonal.at n=7A350712
• Triangular numbers such that the three numbers before it and the three numbers after it are squarefree.at n=31A374393