91521domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(369).at n=10A041699Expansion of exp( Sum_{n>=1} -sigma_2(2*n)*x^n/n ) in powers of x.at n=24A283242Concatenation of the first n odd composite numbers (A071904).at n=2A283801a(n) = 70*binomial(n,8) + 2*binomial(n,4) + 1.at n=13A341705