36580

Appears in sequences

• Number of divisor chains of length n: permutations s_1,s_2,...,s_n of 1,2,...,n such that for all j=1,2,...,n, s_j divides Sum_{i=1..j} s_i.at n=25A067957
• Coefficient of x^2 in minimal polynomial of the continued fraction [1^n,phi,1,1,1,...], where 1^n means n ones and phi = golden ratio = (1 + sqrt(5))/2.at n=11A266707
• p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = 1 - S - S^3.at n=17A291735
• a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 1, a(1) = 1, a(2) = 4, a(3) = -3.at n=26A295677
• Numbers of the form ab such that uphi(ab) = a*b where ab is the concatenation of a and b.at n=35A337523
• Numbers k such that A075255(k) is the square of a prime.at n=24A386954