186980

Appears in sequences

• a(n) = floor(n*phi^19), where phi is the golden ratio, A001622.at n=20A004934
• a(n) = round(n*phi^19), where phi is the golden ratio, A001622.at n=20A004954
• Greatest k such that floor(k/r^n)=n, where r = golden mean = (1+sqrt(5))/2.at n=18A182615
• a(n) = sigma(n)*Lucas(n) where Lucas(n) = A000204(n) and sigma(n) = A000203(n) is the sum of divisors of n.at n=18A225528
• Number of double palindrome structures of length n using a maximum of three different symbols.at n=19A328692