728910

Appears in sequences

• a(n) = (4*n+1)*(4*n+2)*(4*n+3).at n=22A001505
• a(n) = (3*n-1) * 3*n * (3*n+1).at n=29A097321
• a(n) = n*(n+1)*(n^2-2*n+2)/2.at n=35A101375
• Triangle: q=2; m=1; t(n,k) = If[m == 0, n!, Product[Sum[(-1)^i*StirlingS2[ k - 1, i]*(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; b(n,k,m) = If[n == 0, 1, t[n, m]/(t[k, m]*t[n - k, m])].at n=49A156593
• Triangle: q=2; m=1; t(n,k) = If[m == 0, n!, Product[Sum[(-1)^i*StirlingS2[ k - 1, i]*(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; b(n,k,m) = If[n == 0, 1, t[n, m]/(t[k, m]*t[n - k, m])].at n=50A156593
• Numbers whose numerator and denominator of the harmonic mean of their divisors are both Fibonacci numbers.at n=28A348658
• Area of the unique primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=22A380302