20506

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 91.at n=13A020430
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 11.at n=22A031599
• Numbers which contain exactly the same digits (with the correct multiplicity) in 3 different smaller bases.at n=34A059828
• Expansion of q^(-3/4) * eta(q^2)^2 * eta(q^20) / (eta(q)^2 * eta(q^4)) in powers of q.at n=28A146163
• Expansion of eta(q^6)^3 * eta(q^10)^3 / (eta(q^2) * eta(q^3)^2 * eta(q^5)^2 * eta(q^30)) in powers of q.at n=45A257632
• Number T(n,k) of entries in the k-th last blocks of all set partitions of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=40A286416
• Numbers with record number of iterations of x -> A306938(x) required to reach 1 (A306944).at n=14A306978
• a(n) = Sum_{k=0..n} q(n,k) * !k, where q(n,k) = number of partitions of n into k distinct parts and !k = subfactorial of k.at n=31A331518