2119203

Appears in sequences

• a(n) = 6*a(n-1) - 3*a(n-2), a(0)=1, a(1)=3.at n=9A084120
• Colored Motzkin paths where each of the steps has three possible colors.at n=8A132900
• a(n) = 3^(floor(n/2))+3^(floor(n/2)-1)-3^(floor((n-1)/3)).at n=24A170832
• a(n) = 3^(floor(n/2))+3^(floor(n/2)-1)-3^(floor((n-1)/3)).at n=25A170832
• Nonsquare integers >= 2 for which the square of its largest prime factor equals the sum of the squares of its other prime factors, with multiplicity.at n=31A391874