57271

Properties

Appears in sequences

• Primes that are a concatenation of 5, 7 and a prime.at n=21A101249
• Primes from merging of 5 successive digits in decimal expansion of exp(Pi).at n=29A105010
• Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 4 X 4 X 4 subtriangle.at n=11A153915
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=19A192960
• Wiener index of a benzenoid consisting of a chain of n hexagons characterized by the encoding s = 1133 (see the Gutman et al. reference, Sec. 5).at n=22A193399
• a(n) = prime(n*prime(n)).at n=36A228529
• Number of magic labelings of the prism graph I X C_7 with magic sum n.at n=6A244873
• The average Wiener index of the set of all fibonacenes with n hexagons.at n=20A245969
• Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=5A252154
• Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=4A252155
• Number of (n+2) X (6+2) 0..3 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=22A252717
• Prime numbersat n=5809