12006225

Appears in sequences

• Denominator of Sum_{k=1..n} 1/(2*k-1)^2.at n=5A128492
• Numerators of the convergents of the generalized continued fraction 2 + 1^2/(4 + 3^2/(4 + 5^2/(4 + ... ))).at n=7A254795
• Denominators of the Kirchhoff sum index for the n-hypercube graph.at n=12A290345
• Denominators of the partial sums for the Catalan constant A006752: Sum_{k=0..n} ((-1)^k)/(2*k+1)^2, n >= 0.at n=5A294971
• Odd abundant numbers k for which sigma(k) == 3 (mod 4).at n=16A325311
• a(n) is the smallest odd number that has n middle divisors.at n=12A354385
• a(n) is the smallest integer having exactly n odd square divisors (A298735).at n=23A357450
• Indices at which A358777 attains a new value.at n=37A359608
• Square array read by upward antidiagonals: T(n, k) = denominator( 2*k!*(-2)^k*Sum_{m=1..n}( 1/(2*m-1)^(k+1) ) ).at n=39A370691