760320

Appears in sequences

• Denominators of coefficients for central differences M_{3}'^(2*n+1).at n=5A002677
• Denominator of 2*Stirling_2(n,2)/n!.at n=11A002679
• Triangle read by rows: T(n,k) = number of paths of n upsteps U and n downsteps D that contain k UUDs.at n=44A051288
• A triangle related to the GF(z) formulas of the rows of the ED2 array A167560.at n=38A167568
• Order of largest automorphism group of a Hadamard matrix of order 4n.at n=5A206707
• Numbers k for which sigma(k)/k - 7/8 is an integer.at n=1A218429
• Smallest x such that sigma(x)/x = 2*sigma(n)/n where sigma(n) is the sum of divisors of n.at n=15A246827
• Numbers k such that k = Sum_{i=1..j} (d_i mod d), where d_i are their aliquot parts and d is one of them.at n=36A265646
• a(n) = n/(Sum_{k=1..n} 1/phi(A341813(n)*k)).at n=39A341814
• a(n) is the smallest x such that sigma(x)/x = (3/2)*sigma(n)/n where sigma(n) is the sum of divisors of n or -1 if no such x exists.at n=47A349717
• Abundant numbers k such that k^2 + A033880(k)^2 is a perfect square.at n=10A377134
• Number of permutations of [n] having the maximal possible number of pairs of integers i<j in [n] such that their cycle minima have opposite sorting order.at n=22A381531