18248

Appears in sequences

• Numbers k such that 3^k + k is prime.at n=4A057900
• Numbers k such that prime(k) + prime(k+1) + prime(k+2) is a square.at n=21A076305
• Number of labeled trees on <= n nodes.at n=5A117887
• Numbers k such that tau(k) = tau(k+1) mod 691, where tau is Ramanujan's tau function A000594.at n=27A121733
• Number of 3-step self-avoiding walks on an n X n square summed over all starting positions.at n=39A188148
• Number of Ramanujan primes R_k such that 2^(n-1) < R_k <= 2^n.at n=20A190501
• Exponential (or binomial) half-convolution of A000984 (central binomial) with itself.at n=6A203576
• Least numbers k for each base b >= 2 such that N = b^(2^n) + k is prime for 7 consecutive values from n = 0 to n = 6.at n=1A225560
• Least number k such that 3^(2^i) + k is prime for i = 0,1,..,n-1.at n=6A226281
• Least number k such that 9^(2^i) + k is prime for i = 0,1,..,n-1.at n=5A226745
• Positions of 3's in A234323.at n=46A234804
• Number of partitions p of n such that max(p) - (number of parts of p) is a part of p.at n=45A238544
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 366", based on the 5-celled von Neumann neighborhood.at n=7A268202
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 389", based on the 5-celled von Neumann neighborhood.at n=30A271596
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 393", based on the 5-celled von Neumann neighborhood.at n=31A271604
• Rounded value of z(n)*prime(n), where z(n) = imaginary part of n-th nontrivial zero of the Zeta function and prime(n) = n-th prime.at n=36A342756