42523

Appears in sequences

• The Wiener index of the comb-shaped graph |_|_|...|_| with 2n (n>=1) nodes. The Wiener index of a connected graph is the sum of the distances between all unordered pairs of vertices in the graph.at n=38A192023
• G.f. satisfies: -1 = Product_{n>=1} (1-x^n) * (1 - x^n/A(x)) * (1 - x^(n-1)*A(x)), where g.f. A(x) = Sum_{n>=0} a(n)*2*(x/4)^n.at n=4A268300
• Numbers k such that 347*2^k+1 is prime.at n=25A322971
• Number of numbers with sum of digits n in fractional base 4/3.at n=51A364780