53600

Appears in sequences

• a(n) = (1/3)*(n^2 + 2*n + 3)*(n+1)^2.at n=19A014820
• Cupolar numbers: a(n) = (n+1)*(5*n^2 + 7*n + 3)/3.at n=31A096000
• Numbers n such that n, n+1, n+2, n+3, n+4 are all of the form x^2+2*y^2 for nonnegative x, y.at n=27A096783
• Octagonal numbers equal to S*(3S - 2) with 3S - 2 = k^2 and S semiprime.at n=7A124106
• Octagonal numbers of the form C*(3C - 2) with 3C - 2 = k^2 and C a composite number.at n=8A125511
• Lower triangular array, called S1hat(-5), related to partition number array A145372.at n=59A145373
• Number of regions in a "frame" of size n X n (see Comments for definition).at n=15A331776
• Numerator of (1+sigma(s)) / ((s+1)/2), where s is the square of n prime-shifted once (s = A003961(n)^2 = A003961(n^2)).at n=41A337338
• a(n) = 7*n^3 - 6*n^2.at n=19A382251