6969600

Appears in sequences

• Squares of even octagonal numbers.at n=15A014794
• Perfect squares using only the curved digits 0, 3, 6, 8 and 9.at n=31A079655
• Expansion of 1/((1-x^2)(1-5x+x^2)).at n=10A089927
• Numbers that set records for number of divisors of n(n-1).at n=45A192488
• Number of 5Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=13A208144
• Cyclic quadrilateral numbers: numbers m = a*b*c*d such that the integers a,b,c,d are the sides of a cyclic quadrilateral whose area and circumradius are integers.at n=17A218431
• Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.at n=12A264515
• Numbers k such that sigma(k) - 3k is prime.at n=32A306492
• Numbers k where the ratios A099378(k)/k reach a record value.at n=14A348847