20524

Appears in sequences

• a(n) is the sum of products of terms in all partitions of n.at n=16A006906
• a(n)= Sum_{d divides n} a(abs(n/d-d)).at n=15A079580
• Number of fib100 primes (A095088) in range ]2^n,2^(n+1)].at n=20A095068
• Numbers n with property that n^2 contains "1234" as a substring.at n=11A175464
• Least positive integer k such that 1 + 1/2 + ... + 1/k > n/phi, where phi = golden ratio = (1+sqrt(5))/2.at n=16A226160
• Number of length n words on alphabet {0,1} such that the length of every maximal block of 0's (runs) is the same.at n=20A243815
• Expansion of Sum_{i>=1} x^(i*(i+1)/2) / (1 - Sum_{j>=1} x^(j*(j+1)/2))^2.at n=18A281810
• Triangular array read by rows: T(n, k) is the number of zero-energy states from the partition function in the Ising model for a finite n*k square lattice with periodic boundary conditions.at n=9A364781