19573

Appears in sequences

• a(n) = (2*n - 9)*n^2.at n=23A015243
• Numbers k such that 8*10^k + 3*R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=11A056723
• Numbers k for which 10k + 1, 10k + 3, 10k + 7, 10k + 9 and 10k + 13 are primes.at n=12A178084
• Consider a number n with m decimal digits. The sequence lists the numbers n having the prefix of length m-1 in the middle of the decimal expansion of prime(n).at n=25A242956
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 324", based on the 5-celled von Neumann neighborhood.at n=44A271257
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S - 2 S^2)^2.at n=9A291255
• Expansion of 2/((1 - x)*(3 - theta_3(x))), where theta_3() is the Jacobi theta function.at n=27A303667
• E.g.f.: exp(-3) * Sum_{n>=0} ((1+x)^n + 2)^n / n!.at n=4A326432
• Numbers k such that sigma(k) = psi(k) + tau(k) + omega(k)^5.at n=10A391447
• Numbers k such that sigma(k) = psi(k) + tau(k)^2 + omega(k).at n=8A392518