23663

Properties

Appears in sequences

• Safe primes (A005385) (p and (p-1)/2 are primes) such that 12*p+1 is also prime.at n=49A075707
• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[6, 2,6]; short d-string notation of pattern = [626].at n=25A078854
• Primes p such that their cubes are pandigital.at n=21A124629
• Positions of hexagonal pyramidal numbers in the EKG sequence.at n=32A144080
• Primes p such that (p-7)/8 and 8p + 7 are both prime.at n=26A158238
• Pasquale's sequence: a(n) = 2a(n-1) + (-1)^n*floor(n/2), with a(1)=1.at n=14A177143
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically.at n=7A207511
• Number of (n+1)X(1+1) 0..2 arrays x(i,j) with row sums sum{j*x(i,j), j=1..1+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing.at n=6A233046
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays x(i,j) with row sums sum{j*x(i,j), j=1..k+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing.at n=27A233049
• Primes having only {2, 3, 6} as digits.at n=16A260126
• Largest prime factor of 78557*2^n + 1.at n=10A279798
• Array read by antidiagonals: T(m,n) = number of edge covers in the grid graph P_m X P_n.at n=17A286912
• Array read by antidiagonals: T(m,n) = number of edge covers in the grid graph P_m X P_n.at n=18A286912
• Number of edge covers in the grid graph P_3 X P_n.at n=3A288031
• Number of unlabeled rooted phylogenetic trees with n (leaf-) nodes such that for each inner node all children are either leaves or roots of distinct subtrees.at n=14A300660
• Primes p such that the 3 X 3 matrix with components (row by row) prime(k+m), 0 <= m <= 8 has zero determinant, where p = prime(k).at n=5A337160
• Primes p such that (p^1024 + 1)/2 is prime.at n=5A341272
• a(n) is the least prime p that starts a run of 2n+1 consecutive primes whose product is a sum of the same number of (others or same) consecutive primes.at n=18A352065
• Primes having only {0, 2, 3, 6} as digits.at n=35A386043
• Primes having only {2, 3, 4, 6} as digits.at n=37A386140