20139

Appears in sequences

• First row of spectral array W(sqrt(3)).at n=23A022159
• Numbers k such that k*Lucas(k) + 1 is prime.at n=29A134696
• Triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) = number of simple graphs on n labeled nodes with k edges where each maximally connected subgraph has at most one cycle.at n=33A144228
• Numbers n such that n^6 + 272 is prime.at n=26A161998
• Partial sums of A007694.at n=41A174030
• Number of integers in n-th generation of tree T(-2/3) defined in Comments.at n=35A274150
• a(1) = a(3) = 0, and otherwise a(n) is the least multiple of prime(n) whose decimal representation ends with that of prime(n+1).at n=32A333845
• Triangle of coefficients in g.f. A(x,y) which satisfies: A(x,y) = Sum_{n>=0} x^n/(1 - x*y*A(x,y)^n).at n=69A340910
• Triangle of coefficients in g.f. A(x,y) which satisfies: A(x,y) = Sum_{n>=0} x^n/(1 - x*y*A(x,y)^n).at n=74A340910