24880

Appears in sequences

• Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=25A006145
• Expansion of 1/((1-2*x)*(1-12*x)).at n=4A016136
• Numbers k such that sopf(k) = sopfr(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=28A064678
• Number of ways to build an expression using non-redundant parentheses in an expression of n variables, counted in decreasing sub-partitions of equal size.at n=9A245390
• Sum of the fourth largest parts in the partitions of n into 6 parts.at n=49A308870
• Expansion of Product_{k>=1} (1 + x^sigma(k)) / (1 - x^sigma(k)).at n=35A333045
• a(n) is the number of partitions of n in which no part is divisible by 3 minus the number of basis partitions of n.at n=55A350636
• Expansion of g.f. A(x) satisfying A(x) = 1 + x*(A(x)^2 - A(-x)^2)/2 + x*(A(x)^4 + A(-x)^4)/2.at n=8A368628