27967

Properties

Appears in sequences

• Number of sensed planar maps with n edges and without loops or parallel edges.at n=10A006394
• Primes that are palindromic in base 9.at n=40A029977
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=31A031858
• Base-9 palindromes that start with 4.at n=41A043031
• Prime number spiral (clockwise, North spoke).at n=28A054551
• Expansion of 1/(1-3*x-2*x^2-2*x^3).at n=8A077831
• Numerators of the coefficients of (x-1)(x-2)... in the interpolating polynomial through the first n primes.at n=19A118210
• Pyramid game person numbers that have integer solutions.at n=29A135051
• a(n) = total number of different ways a grasshopper can take n hops.at n=20A141002
• Number of n X n binary arrays with all ones connected only in a 1110-1111 pattern in any orientation.at n=6A146738
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation.at n=14A146740
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation.at n=15A146740
• Primes p such that p*floor(p/2)-2 and p*floor(p/2)+2 are also prime numbers.at n=35A164621
• Primes of the form 8*n^2 + 2*n + 1.at n=26A188382
• 1/3 the number of n X n 0..2 symmetric matrices with every element equal to zero, two, three or four horizontal and vertical neighbors.at n=4A211051
• Number of nX4 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX4 array.at n=4A219456
• Number of nX5 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX5 array.at n=3A219457
• T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nXk array.at n=31A219460
• T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nXk array.at n=32A219460
• Primes equal to the sum of both two and three successive semiprimes.at n=23A255897