89800

Appears in sequences

• First occurrence of n in A084511.at n=11A084517
• Numbers n such that every digit of both n and n^2 contains a loop (only digits 0,4,6,8,9 in n and n^2).at n=24A107626
• Triangle T(n,k) = total of number at last index for all set partitions of n into k parts.at n=48A120095
• Numbers k such that k and k^2 use only the digits 0, 4, 6, 8 and 9.at n=25A136956
• Number of partitions of n such that (number parts having multiplicity 1) is a part or (number of parts > 1) is a part.at n=47A241515
• Numbers k such that 8*10^k + 81 is prime.at n=23A287680
• p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = 1 - S - S^4.at n=20A291738
• G.f.: Sum_{n>=0} (n+1)*(n+2)*(n+3)/3! * (x + x^n)^n.at n=47A325999
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of regions in that figure.at n=37A337700
• G.f. A(x) satisfies A(x) = 1 / (1 - x - x * A(x^5)).at n=16A367661