133923132

Appears in sequences

• a(n) = floor(n*3^(n/2)).at n=27A128443
• a(n) = (n^3 + n^2)*9^n.at n=5A129009
• Numbers n such that (A000203(n)+28)/n is an integer.at n=29A162302
• Expansion of (1+27x^2-54x^3)/((1+3x)^2*(1-3x+9 x^2)).at n=14A168075
• Triangle T(n,k) read by rows: T(n,k) is the number of rooted hypertrees on n labeled vertices with k hyperedges, n >= 2, k >= 1.at n=34A210586
• 3-deficient numbers with increasing abundancy: Numbers k such that sigma(m)/m < sigma(k)/k < 3 for all numbers m < k such that sigma(m)/m < 3.at n=31A307122