12960000

Appears in sequences

• a(n) = denominator of sum_{k=1..n} k^(-4).at n=5A007480
• a(n) = denominator of sum_{k=1..n} k^(-4).at n=4A007480
• a(n) = (2*n)^4.at n=30A016744
• a(n) = (3*n)^4.at n=20A016768
• a(n) = (4*n)^4.at n=15A016804
• a(n) = (5n)^4.at n=12A016852
• a(n) = (6*n)^4.at n=10A016912
• a(n) = (7*n + 4)^4.at n=8A017032
• a(n) = (8*n + 4)^4.at n=7A017116
• a(n) = (9*n + 6)^4.at n=6A017236
• a(n) = (10*n)^4.at n=6A017272
• a(n) = (11*n + 5)^4.at n=5A017452
• a(n) = (12*n)^4.at n=5A017524
• Denominators of 1/4!*(H(n,1)^4+6*H(n,1)^2*H(n,2)+8*H(n,1)*H(n,3)+3*H(n,2)^2+6*H(n,4)), where H(n,m) = Sum_{i=1..n} 1/i^m are generalized harmonic numbers.at n=5A072914
• Denominators of 1/4!*(H(n,1)^4+6*H(n,1)^2*H(n,2)+8*H(n,1)*H(n,3)+3*H(n,2)^2+6*H(n,4)), where H(n,m) = Sum_{i=1..n} 1/i^m are generalized harmonic numbers.at n=4A072914
• Denominators of the triangle of coefficients T(n,k), read by rows, that satisfy: y^x = Sum_{n=0..x} R_n(y)*x^n for all nonnegative integers x, y, where R_n(y) = Sum_{k=0..n} T(n,k)*y^k and T(n,k) = A107045(n,k)/a(n,k).at n=22A107046
• Even refactorable numbers k such that the number r of odd divisors is odd, the number s of even divisors is even, both r and s are divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=20A120359
• Denominator of partial sums for a series of (17/18)*Zeta(4)= (17/1680)*Pi^4.at n=4A130417
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k even entries that are followed by a smaller entry (n>=0, k>=0).at n=39A134434
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k odd entries that are followed by a smaller entry (n >= 0, k >= 0).at n=33A134435