35137127025domain: NAppears in sequencesDenominators of coefficients of expansion of arctan(x)^2 = x^2-2/3*x^4+23/45*x^6-44/105*x^8+563/1575*x^10-3254/10395*x^12+ ...at n=14A071968Smallest odd number with same number of divisors as 3*a(n-1).at n=26A140864Denominators of Integral_{x=0..Pi/2} sin(2*n*x)*log(cosec(x)) dx.at n=28A225123