76128

Appears in sequences

• a(1) = 1, a(n) = Sum_{k=1..pi(n)} a(n-k) for n > 1, where pi(n) is the number of primes less than or equal to n.at n=18A123341
• Numbers k such that (86*10^k + 121)/9 is prime.at n=25A283185
• The second Zagreb index of the Aztec diamond AZ(n) (see the Ramanes et al. reference, Theorem 2.2).at n=33A292345
• Square array read by antidiagonals upwards in which row k has k as its first term and each subsequent term is the least possible value such that the sum of any 2 or more terms does not equal a prime.at n=52A305579
• Number of n-step self-avoiding walks on a 2D square lattice where each visited lattice point is either a neighbor of the first visited lattice point, else the first visited lattice point is directly visible (cf. A358036) from the lattice point when it is first visited.at n=15A368614