28393365

Appears in sequences

• Denominators of cosecant numbers: -2*(2^(2*n-1)-1)*Bernoulli(2*n).at n=30A001897
• a(n) = Product_{p-1 divides n} p, where p is an odd prime.at n=60A141459
• Odd numbers k such that A(k) == 0 (mod k) (see Comments for details).at n=21A308242
• a(n) = denominator(n!*[z^n]((cosh(x*z) + cos(x*z))*z/(1 - exp(-z)))(1)).at n=60A318142
• Smallest k for which A389781(k) = n.at n=23A388296