30400

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 87.at n=39A031585
• a(n)=If[IntegerQ[((6*n - 4)/( n + 1))*a(n - 1)], ((6*n - 4)/(n + 1))* a(n - 1), If[IntegerQ[((4*n - 2)/(n + 1))*a( n - 1)], ((4*n - 2)/(n + 1))*a(n - 1), n*a(n - 1)]].at n=9A155581
• Numbers with 42 divisors.at n=25A175750
• Numbers of the form p^6*q^2*r where p, q, and r are distinct primes.at n=23A179703
• Number of n X 7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=3A207598
• T(n,k) = Number of n X k 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=48A207599
• Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=6A207601
• A boustrophedon triangle.at n=50A227862
• Number of partitions of n whose median is not a part.at n=48A238479
• a(n) = 19*n^2.at n=40A244631
• a(n) = n^2*(2*n - 3 - (-1)^n)/4.at n=39A303692
• a(n) is the lowest nonnegative exponent k such that n!^k is the product of the divisors of n!.at n=20A344687
• Row lengths of irregular triangle A381587.at n=24A381357