24012450

Appears in sequences

• -arcsinh(log(x+1)-arctanh(x))=1/2!*x^2+6/4!*x^4+105/6!*x^6+3780/8!*x^8...at n=6A013300
• Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd 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=32A120358